Lihat sumber bagi Varian Delta SARS-CoV-2

'''Varian Delta SARS-CoV-2''', juga dikenali sebagai '''garis keturunan B.1.617.2''', adalah [[Varian SARS-CoV-2|varian]] keturunan B.1.617 dari [[SARS-CoV-2]], [[virus]] yang menyebabkan [[COVID-19]].<ref name="gov.uk">{{cite news|url=https://www.gov.uk/government/news/confirmed-cases-of-covid-19-variants-identified-in-uk |title=Confirmed cases of COVID-19 variants identified in UK |website=www.gov.uk |date=15 April 2021 |access-date=2021-04-20}}</ref> Varian ini pertama kali dikesan di [[India]] pada akhir tahun 2020.<ref name="GISAID">{{cite web |url=https://www.gisaid.org/hcov19-variants/ |title=Tracking of Variants |date=26 April 2021 |website=gisaid.org |publisher=[[GISAID]] |access-date=4 Ogos 2021}}</ref><ref name="SMC1">{{cite web |title=Expert reaction to cases of variant B.1.617 (the 'Indian variant') being investigated in the UK |url=https://www.sciencemediacentre.org/expert-reaction-to-cases-of-variant-b-1-617-the-indian-variant-being-investigated-in-the-uk/ |publisher=Science Media Centre |access-date=20 April 2021}}</ref> [[Pertubuhan Kesihatan Sedunia]] (WHO) menamakan varian ini sebagai varian Delta pada 31 Mei 2021.<ref name="BBC.May.31.2021">{{cite news|date=2021-05-31|title=Covid: WHO renames UK and other variants with Greek letters|publisher=BBC News|url=https://www.bbc.com/news/world-57308592|access-date=2021-06-08}}</ref>

[[File:Delta Variant countries.svg|thumb|upright=1.5|Negara-negara yang melaporkan kes yang disahkan varian Delta sehingga 9 Julai 2021 (GISAID)
<br>
'''Petunjuk:'''
{{legend|#510000|5,000+ kes yang disahkan}}
{{legend|#900000|1,000–4,999 kes yang disahkan}}
{{legend|#c80200|100–999 kes yang disahkan}}
{{legend|#ee7070|10–99 kes yang disahkan}}
{{legend|#ffc0c0|2–9 kes yang disahkan}}
{{legend|#ffdfe0|1 kes yang disahkan}}
{{legend|#e0e0e0|0 kes atau tiada data}}
]]

Varian ini mempunyai perubahan T478K, P681R, dan L452R dalam gen yang mengekod protein pepaku SARS-CoV-2, yang diketahui mengubah penularan virus dan sama ada ia dapat dineutralkan oleh antibodi untuk varian virus COVID-19 yang menular sebelum ini. Kadar serangan sekunder adalah 51 hingga 67 peratus lebih tinggi daripada [[Varian Alpha SARS-CoV-2|varian Alpha]] pada Mei 2021, menurut Public Health England (PHE). [[Vaksin COVID-19]] berjaya mencegah keseriusan jangkitan atau kemasukan ke hospital sekiranya dijangkiti varian ini. Namun demikian, beberapa penyelidikan mendapati bahawa orang yang telah divaksinasi lebih cenderung mengalami gejala dari varian Delta berbanding varian SARS-CoV-2 yang lain.

PHE mengubah garis keturunan B.1.617.2 dari varian yang sedang disiasat (VUI) menjadi [[varian yang membincangkan]] (VOC) pada 7 Mei 2021, berdasarkan penilaian kebolehterlakan sekurang-kurangnya setara dengan B.1.1.7 (varian Alpha). SAGE UK menganggarkan varian ini berkemungkinan “realistik” 50 peratus lebih mudah menular. WHO menetapkan garis keturunan VOC ini pada 11 Mei 2021, dan menyatakan bahawa varian ini mempunyai bukti penularan yang lebih besar dan peneutralan yang lebih rendah.  [[Pusat Kawalan dan Pencegahan Penyakit]] (CDC) menamakan Delta sebagai VOC pada 15 Jun 2021.

Varian Delta dipercayai bertanggungjawab ke atas gelombang kedua pandemik, yang telah melanda India pada Februari 2021. Akhirnya, varian ini mengakibatkan gelombang ketiga di [[Fiji]], [[United Kingdom]], dan [[Afrika Selatan]]. WHO memberi amaran pada bulan Julai 2021 bahawa varian ini mungkin akan merebak lebih jauh lagi di Eropah dan Afrika. Varian ini juga telah menyebabkan peningkatan jangkitan harian di beberapa negara [[Asia]], [[Amerika Syarikat]], dan [[Australia]] pada akhir bulan Julai.

Varian Delta telah merebak ke 124 negara setakat 20 Julai 2021, menurut WHO, dan walaupun varian tersebut bukan strain dominan, ia akan menjadi strain dominan dan paling berbahaya di seluruh dunia.

== Klasifikasi ==
D614G, T478K, P681R, dan L452R adalah perubahan dalam gen yang menghasilkan protein pepaku SARS-CoV-2 dalam varian Delta. Menurut sistem klasifikasi filogenetik Nextstrain, ia tergolong dalam clade 21A.

Setelah menerapkan strategi baru menggunakan [[huruf Yunani]] untuk varian yang membincangkan (VOC) dan varian yang berkepentingan (VOI), WHO mengeluarkan label Delta untuk garis keturunan B.1.617.2 pada akhir bulan Mei 2021.

=== Sub-garis keturunan yang lain bagi B.1.617 ===
Setakat ini, keturunan B.1.617 telah dibahagikan kepada tiga sub-garis keturunan.

Public Health England (PHE) mengenal pasti B.1.617.1 sebagai varian di bawah siasatan pada April 2021. Dua varian lagi, B.1.617.2 dan B.1.617.3, diklasifkasi sebagai varian di bawah siasatan pada April 2021. B.1.617.3 mempunyai mutasi L452R dan E484Q yang sama dengan B.1.617.2. Namun, B.1.617.2 tidak mempunyai mutasi E484Q. Mutasi T478K dikesan di B.1.617.2 tetapi tidak di B.1.617.1 atau B.1.617.3.

=== Mutasi ===
[[File:SARS-CoV-2 Delta variant.svg|thumb|Mutasi asid amino varian Delta SARS-CoV-2 digambarkan pada peta genom SARS-CoV-2 dengan fokus pada pepaku.<ref>[https://covdb.stanford.edu/page/mutation-viewer/#sec_delta Spike Variants: Delta variant, aka B.1.617.2] 24 Jun 2021, ''covdb.stanford.edu'', dicapai 1 Julai 2021</ref>]]

{| class="wikitable mw-collapsible autocollapse" align="right" style="text-align: center;"
 |+ {{nowrap|Mendefinisikan mutasi dalam<br>varian Delta SARS-CoV-2{{Break}} }}
 ! [[Gen]]
 ! [[Nukleotida]]
 ! [[Asid amino]]
 |-
 !rowspan="2"| Rangka bacaan terbuka (ORF1b)
 |   || P314L 
 |-
 |  ||  P1000L
 |-
 !rowspan="10"| Pepaku (''spike'')
 |  || G142D
 |-
 |  || T19R
 |-
 |  || R158G
 |-
 |  || L452R
 |-
 |  || T478K
 |-
 |  || D614G
 |-
 |  || P681R
 |-
 |  || D950N
 |-
 |  || E156del
 |-
 |  || F157del
 |-
 !rowspan="1"| Protein membran koronavirus
 |  || I82T
 |-
 !rowspan="3"| Protein nukleokapsid koronavirus
 |  || D63G
 |-
 |  || R203M
 |-
 |  || D377Y
 |-
 !rowspan="1"|  orf3a
 |  || S26L
 |-
 !rowspan="2"|  orf7a
 |  || V82A
 |-
 |  || T120I
 |- style="text-align:left;" class="sortbottom"
 | colspan="3" | Sumber: CDC<ref>{{cite web |url=https://www.cdc.gov/coronavirus/2019-ncov/variants/variant-info.html |title=SARS-CoV-2 Variant Classifications and Definitions |author=<!--Not stated--> |date=15 June 2021 |website=cdc.gov |publisher=Centers for Disease Control and Prevention |access-date=2021-06-18}}</ref> Covariants.org<ref name="Nextstrain1">{{cite web |url=https://covariants.org/variants/21A.S.478K |title=Dedicated 21A.S.478K Nextstrain build |date=15 June 2021 |website=covariants.org |access-date=2021-06-19}}</ref>
|}

Terdapat 13 mutasi dalam Delta atau genom B.1.617.2 (15 atau 17 menurut sumber lain, bergantung kepada sama ada mutasi yang lebih umum disertakan) yang menyebabkan perubahan dalam turutan asid amino protein yang dikodkannya. Empat daripadanya sangat membincangkan, kerana semuanya terdapat dalam turutan protein pepaku virus:

* D614G. Perubahan asid-ke-glisin aspartik pada kedudukan 614 dikongsi dengan varian lain yang sangat mudah menular seperti Alpha, Beta, dan Gamma.
* T478K. Penggantian threonine-ke-lisin pada kedudukan 478.
* L452R. Perubahan leukin-ke-arginin pada kedudukan 452 menghasilkan pertalian protein pepaku yang lebih besar untuk reseptor ACE2 dan keupayaan pengiktirafan sistem imun yang lebih rendah. Perubahan ini tidak unik untuk varian tereebut apabila dipertimbangkan secara individu; sebaliknya, kehadiran mereka adalah secara serentak.
* P681R. Penggantian prolin-ke-arginin pada kedudukan 681 dapat meningkatkan kebolehjangkitan tahap sel varian “dengan memungkinkan pembelahan protein prekursor S ke konfigurasi S1/S2 aktif,” menurut William A. Haseltine.

Tiada mutasi E484Q dalam genom B.1.617.2.

=== Varian “Delta plus” ===
Varian Delta dengan mutasi K417N telah dikenali sebagai “Delta plus” atau “varian Nepal” kerana berkaitan dengan keturunan AY.1 dan AY.2.<ref>{{cite techreport |type=Briefing |title=SARS-CoV-2 variants of concern and variants under investigation in England, technical briefing 16 |id=GOV-8641 |institution=Public Health England |date=2021-06-18 |url=https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/994839/Variants_of_Concern_VOC_Technical_Briefing_16.pdf |format=PDF |access-date=2021-06-23}}</ref><ref>{{cite news | vauthors = Cutler, S |title='Nepal variant': what we've learned so far |url=https://theconversation.com/nepal-variant-what-weve-learned-so-far-162227 |access-date=6 August 2021 |work=The Conversation |date=18 June 2021}}</ref> Terdapat mutasi K417N seperti dalam [[Varian Beta SARS-CoV-2|varian Beta]].<ref>{{cite news |last1=Sample |first1=Ian |title= Nepal Covid variant: does it exist and should we be concerned? |url= https://www.theguardian.com/world/2021/jun/03/nepal-covid-variant-does-it-exist-should-concerned |access-date=June 23, 2021 |work=[[The Guardian]] |date=June 3, 2021}}</ref> Penggantian lisin-ke-asparagin berlaku di kedudukan 417.<ref>{{cite journal |last1=Tang |first1=Julian W. |last2=Oliver |first2=T.R. |date=2021 |title=Introduction of the South African SARS-CoV-2 variant 501Y.V2 into the UK |journal=The Journal of Infection |volume=82 |issue=4 |pages=e8–e10 |doi=10.1016/j.jinf.2021.01.007 |pmc=7813514 |pmid=33472093 }}</ref>

Varian AY.3 menyumbang kira-kira 21 peratus kes di Amerika Syarikat pada 15 Julai 2021.<ref>{{cite web |title=AY.3 Lineage Report |url=https://outbreak.info/situation-reports?loc=USA&pango=AY.3&selected=USA |website=outbreak.info |access-date=18 July 2021}}</ref>

== Gejala ==
{{see also|Gejala COVID-19}}
Terdapat kemungkinan bahawa gejala yang paling lazim telah berubah daripada yang secara tradisional dikaitkan dengan COVID-19 asal. Individu yang dijangkiti mungkin tersilap dengan gejala demam teruk dan gagal menyedari bahawa mereka perlu mengasingkan diri. Sakit kepala, sakit tekak, hidung berair, dan demam semuanya dicatat sebagai gejala biasa.<ref>{{cite news|last=Grover|first=Natalie|date=14 June 2021|title=Delta variant Covid symptoms 'include headaches, sore throat and runny nose'|url=https://www.theguardian.com/world/2021/jun/14/delta-variant-covid-symptoms-include-headaches-sore-throat-and-runny-nose|work=[[The Guardian]]|location=London|access-date=2021-06-30}}</ref><ref>{{cite news |last=Roberts |first=Michelle |date=14 June 2021 |title=Headache and runny nose linked to Delta variant |url=https://www.bbc.co.uk/news/health-57467051 |work=[[BBC News]] |location=London |access-date=2021-07-02}}</ref> Satu kajian mendapati bahawa sakit kepala, sakit tekak, dan hidung berair adalah gejala yang paling sering dilaporkan di United Kingdom, di mana varian Delta menyumbang 91 peratus kes baharu.<ref>{{cite news |last=Radcliffe |first=Shawn |date=14 June 2021 |title=The COVID-19 Delta Variant: Here's Everything You Need to Know |url=https://www.healthline.com/health-news/the-covid-19-delta-variant-heres-everything-you-need-to-know#What-symptoms-does-the-Delta-variant-cause? |work=Healthline |access-date=2021-07-02}}</ref>

== Pencegahan ==
{{see also|COVID-19#Pencegahan|Vaksin COVID-19}}
{|class="wikitable floatright" style="width:350px;" 
|+Rumusan perlindungan vaksin terhadap varian Delta<br />{{small|(Kemas kini [[Pertubuhan Kesihatan Sedunia|WHO]], 20 Julai 2021<ref name="WHO-weekly-update-2021-07-20" />)}}
	!Penyakit atau jangkitan
	|'''Keterukan''': perlindungan kekal<br />'''Bergejala''': kemungkinan perlindungan berkurang
|-
	![[COVID-19#Prognosis|Penyakit teruk]]
	|{{Steady}}: [[Vaksin COVID-19 Oxford–AstraZeneca|AstraZeneca-Vaxzevria]](1), [[Vaksin COVID-19 Pfizer–BioNTech|Pfizer-BioNTech]](1)
|-
	!Penyakit bergejala
	|{{Steady}} ke {{Decrease}}: Pfizer-BioNTech(3) <br />{{Decrease}}: [[BBV152|Covaxin]](1) <br />{{Decrease}}{{Decrease}}: AstraZeneca-Vaxzevria(2)
|-
	!Jangkitan
	|{{Decrease}}: AstraZeneca-Vaxzevria(1), Pfizer-BioNTech(1)
|-
	|colspan=2|{{small|Besarnya penurunan keberkesanan vaksin ditunjukkan oleh simbol. Perhatikan bahawa penurunan keberkesanan vaskin tidak menunjukkan hilangnya perlindungan; kadar perlindungan yang tinggi (seperti 95%) dengan penurunan kecil (seperti 10%) masih akan memberikan perlindungan (seperti 85%). Jumlah kajian yang menyokong indikasi diberikan dalam kurungan.
{{Steady}}: Keberkesanan vaskin berkurangan <10%, atau keberkesanan vaskin >90% tanpa pembanding<br />
{{Decrease}}: VE berkurangan antara 10 hingga <20%<br />
{{Decrease}}{{Decrease}}: Keberkesanan vaskin berkurangan antara 20 hingga <30%}}
|}
{|class="wikitable floatright" style="width:350px;" 
|-
	!Kesan terhadap peneutralan (divaksin sepenuhnya)<ref name="WHO-weekly-update-2021-07-20" />
|-
	|{{Steady}}: [[Vaksin COVID-19 Johnson & Johnson|Johnson]](1) <br />{{Decrease}}: [[ZF2001|Anhui-ZIFIVAX]](1), [[Vaksin COVID-19 Oxford–AstraZeneca|AstraZeneca-Vaxzevria]](2), [[BBV152|Covaxin]](1), [[Vaksin COVID-19 Moderna|Moderna]](2), [[Covishield]](1) <br />{{Decrease}} ke {{Decrease}}{{Decrease}}: [[Vaksin COVID-19 Pfizer–BioNTech|Pfizer-BioNTech]](6) <br />{{Decrease}} ke {{Decrease}}{{Decrease}}{{Decrease}}: [[CoronaVac]](2)
|-
	|{{small|Besarnya pengurangan peneutralan dengan vaksinasi penuh ditunjukkan oleh simbol. Jumlah kajian yang menyokong indikasi diberikan dalam kurungan.
{{Steady}}: Peneutralan berkurangan <2 kali ganda <br />
{{Decrease}}: Peneutralan berkurangan 2 hingga <5 kali ganda <br />
{{Decrease}}{{Decrease}}: Peneutralan berkurangan 5 hingga <10 kali ganda <br />
{{Decrease}}{{Decrease}}{{Decrease}}: Peneutralan berkurangan ≥ 10 kali ganda}}
|}

Walaupun WHO belum memberikan cadangan pencegahan khusus untuk varian Delta, pendekatan bukan farmaseutikal yang ditunjukkan untuk mengelakkan COVID-19 jenis agresif tetap berkesan. Ini termasuk mencuci tangan, memakai pelitup muka, menjaga jarak yang selamat dari orang lain, menghindari menyentuh mulut, hidung, atau mata, mengelakkan tempat tertutup yang sesak dengan pengudaraan yang teruk, terutama ketika bercakap, menjalani saringan jika bergejala, dan mengasingkan diri jika tidak sihat.<ref>{{cite web|url=https://www.who.int/emergencies/diseases/novel-coronavirus-2019/advice-for-public|website=WHO|title=Advice for Public|access-date=14 July 2021}}</ref> Pegawai kesihatan awam harus terus menggunakan ujian untuk mencari individu yang dijangkiti, mengesan kontak rapat mereka, dan mengasingkan mereka yang telah disahkan positif atau terdedah.<ref>{{cite web|url=https://www.who.int/teams/risk-communication/health-workers-and-administrators|website=WHO|title=Health Workers and Administrators|access-date=14 July 2021}}</ref> Sebarang risiko besar perhimpunan besar-besaran harus dinilai, dan rancangan yang dikembangkan untuk mengurangkan risiko ini.<ref>{{cite web|url=https://www.who.int/publications/i/item/10665-332235|website=WHO|title=Key planning recommendations for mass gatherings in the context of the current COVID-19 outbreak|access-date=14 July 2021}}</ref>

ICMR mendapati bahawa sera pesakit COVID-19 dan penerima vaksin BBV152 (Covaxin) Bharat Biotech dapat meneutralkan varian di bawah siasatan B.1.617, walaupun dengan keberkesanan yang lebih rendah.<ref>{{cite journal |last1=Yadav |first1=PD |last2=Sapkal |first2=GN |last3=Abraham |first3=P |last4=Ella |first4=R |last5=Deshpande |first5=G |last6=Patil |first6=DY |last7=Nyayanit |first7=DA |last8=Gupta |first8=N |last9=Sahay |first9=RR |last10=Shete |first10=AM |last11=Panda |first11=S |last12=Bhargava |first12=B |last13=Mohan |first13=VK |display-authors=6 |title=Neutralization of variant under investigation B.1.617 with sera of BBV152 vaccinees. |journal=Clinical Infectious Diseases |date=7 May 2021 |doi=10.1093/cid/ciab411 |pmid=33961693}}</ref>

Menurut Anurag Agrawal, pengarah Institut Genomik dan Biologi Integratif (IGIB), kajian mengenai keberkesanan vaksin semasa pada garisan keturunan B.1.617 menunjukkan bahawa jangkitan adalah lebih ringan selepas vaksinasi.<ref>{{cite web|title=Covishield Covaxin effective against 'Indian strain' of coronavirus study suggests|url=https://www.theweek.in/wire-updates/national/2021/04/27/del80-vaccine-double-mutant-efficacy.html|access-date=2021-04-27|website=The Week|language=en}}</ref>

Ketua Penasihat Perubatan kepada Presiden Amerika Syarikat, [[Anthony Fauci]], juga telah menyatakan keyakinan beliau terhadap penemuan awal. Beliau berkata dalam satu wawancara pada 28 April bahawa: {{Quote|Ini adalah kawasan di mana kita masih mengumpulkan maklumat setiap hari. Walau bagaimanapun, penyelidikan terbaru melihat sera pemulihan pesakit COVID-19 dan individu-individu yang telah mengambil vaksin Covaxin, yang digunakan di India. Ia didapati dapat meneutralkan varian 617.<ref>{{cite news |title=Covaxin found to neutralise 617 variant of COVID-19, says Dr. Fauci |url=https://www.thehindu.com/news/international/covaxin-found-to-neutralise-617-variant-of-covid-19-says-dr-fauci/article34428175.ece |work=The Hindu |date=28 April 2021 |language=en-IN}}</ref>}}

Sera yang divaksinasi Covishield (vaksin Oxford–AstraZeneca) menawarkan perlindungan terhadap keturunan B.1.617, menurut kajian yang dilakukan oleh Pusat Biologi Sel dan Molekul (CCMB) di Hyderabad.<ref>{{cite news |title=Covishield, Covaxin effective against 'Indian strain' of coronavirus, study suggests - ET HealthWorld |url=https://health.economictimes.indiatimes.com/news/industry/covishield-covaxin-effective-against-indian-strain-of-coronavirus-study-suggests/82283901 |work=ETHealthworld.com |publisher=[[The Economic Times]] |date=28 April 2021 |language=en|url-access=registration}}</ref>

Menurut penyelidikan yang dijalankan oleh Public Health England, mereka yang diberi vaksin [[Vaksin COVID-19 Pfizer–BioNTech|Pfizer–BioNTech]] atau [[Vaksin COVID-19 Oxford–AstraZeneca|Oxford-AstraZeneca]] mempunyai 33 peratus lebih sedikit kes jangkitan bergejala yang disebabkan oleh varian setelah dos pertama. Jika dibandingkan dengan mereka yang tidak diberi vaksin, 88 peratus lebih sedikit pesakit bergejala dari varian Delta dua minggu setelah mendapat dos kedua vaksin Pfizer-BioNTech. Jika dibandingkan dengan individu yang tidak dilindungi, 60 peratus lebih sedikit pesakit bergejala dari varian Delta dua minggu setelah mendapat dos kedua vaksin AstraZeneca-Oxford.<ref>{{cite news |last1=Ellyatt |first1=Holly |title=Two doses of Covid vaccines provide effective protection against variant found in India: Study |url=https://www.cnbc.com/2021/05/24/two-doses-of-covid-vaccines-provide-protection-against-india-variant.html |work=CNBC |date=2021-05-24 |language=en}}</ref><ref name=":7">{{cite document |last1=Bernal |first1=Jamie Lopez |last2=Andrews |first2=Nick |last3=Gower |first3=Charlotte |last4=Gallagher |first4=Eileen |last5=Simmons |first5=Ruth |last6=Thelwall |first6=Simon |last7=Stowe |first7=Julia |last8=Tessier |first8=Elise |last9=Groves |first9=Natalie |last10=Dabrera |first10=Gavin |last11=Myers |first11=Richard |last12=Campbell |first12=Colin |last13=Amirthalingam |first13=Gayatri |last14=Edmunds |first14=Matt |last15=Zambon |first15=Maria |last16=Brown |first16=Kevin |last17=Hopkins |first17=Susan |last18=Chand |first18=Meera |last19=Ramsay |first19=Mary |display-authors=6 |title=Effectiveness of COVID-19 vaccines against the B.1.617.2 variant |work=medRxiv |date=2021-05-24 |doi=10.1101/2021.05.22.21257658 |url=https://www.medrxiv.org/content/10.1101/2021.05.22.21257658v1 |language=en}}</ref>

Individu yang divaksin sepenuhnya dengan vaksin Pfizer-BioNTech berkemungkinan mempunyai tahap antibodi peneutralan lebih daripada lima kali lebih rendah terhadap varian Delta daripada strain COVID-19 yang asal, menurut satu kajian yang diterbitkan di ''The Lancet'' oleh sekumpulan penyelidik dari Francis  Institut Crick.

Pada bulan Jun 2021, Public Health England mendedahkan hasil penyelidikan yang mendapati vaksin Pfizer-BioNTech dan vaksin AstraZeneca adalah 96 peratus dan 92 peratus berkesan untuk mencegah kemasukan ke hospital dari varian Delta setelah menerima dua dos.

Para penyelidik dari universiti-universiti di Toronto dan Ottawa di Ontario, Kanada, menerbitkan sebuah makalah pra cetak pada 3 Julai yang menunjukkan bahawa vaksin Moderna dapat mencegah kematian atau kemasukan ke hospital disebabkan oleh varian Delta.

Dalam sebuah kajian yang diterbitkan pada bulan Julai 2021 oleh University of Sri Jayewardenepura, didapati bahawa vaksin Sinopharm BBIBP-CorV menyebabkan penukaran serok pada 95 peratus mereka yang telah menerima kedua-dua dos vaksin tersebut.  Kadarnya sedikit lebih rendah pada kumpulan umur lebih 60 tahun (93.3 peratus), tetapi jauh lebih tinggi pada kumpulan umur 20 hingga 39 (98.9 peratus). Antibodi peneutralan ditemukan pada 81.25 peratus daripada mereka yang telah divaksinasi.<ref>{{Cite web|date=2021-07-20|title=Over 95% individuals developed antibodies against the Sinopharm vaccine - USJ Researchers|url=https://www.sjp.ac.lk/news/the-sinopharm-vaccine-induces-robust-antibody-responses-in-individuals-in-sri-lanka/|access-date=2021-07-20|website=USJ - University of Sri Jayewardenepura, Sri Lanka|language=en-US}}</ref><ref>{{Cite document|last1=Jeewandara|first1=Chandima|last2=Aberathna|first2=Inoka Sepali|last3=Pushpakumara|first3=Pradeep Dharshana|last4=Kamaladasa|first4=Achala|last5=Guruge|first5=Dinuka|last6=Jayathilaka|first6=Deshni|last7=Gunesekara|first7=Banuri|last8=Tanussiya|first8=Shyrar|last9=Kuruppu|first9=Heshan|last10=Ranasinghe|first10=Thushali|last11=Dayarathne|first11=Shashika|date=2021-07-19|title=Antibody and T cell responses to Sinopharm/BBIBP-CorV in naive and previously infected individuals in Sri Lanka|url=https://www.medrxiv.org/content/10.1101/2021.07.15.21260621v1|work=medRxiv|language=en|pages=2021.07.15.21260621|doi=10.1101/2021.07.15.21260621}}</ref>

Penyelidik dari Public Health England menerbitkan kajian pada 21 Julai yang mendapati vaksin Pfizer berkesan 93.7 peratus selepas dua dos terhadap varian Delta, tetapi vaksin Astrazeneca hanya 67 peratus berkesan.<ref>{{cite journal | last1 = Lopez Bernal | first1 = Jamie | last2 = Andrews | first2 = Nick | last3 = Gower | first3 = Charlotte | last4 = Gallagher | first4 = Eileen | last5 = Simmons | first5 = Ruth | last6 = Thelwall | first6 = Simon | last7 = Stowe | first7 = Julia | last8 = Tessier | first8 = Elise | last9 = Groves | first9 = Natalie | last10 = Dabrera | first10 = Gavin | last11 = Myers | first11 = Richard | last12 = Campbell | first12 = Colin N.J. | last13 = Amirthalingam | first13 = Gayatri | last14 = Edmunds | first14 = Matt | last15 = Zambon | first15 = Maria | last16 = Brown | first16 = Kevin E. | last17 = Hopkins | first17 = Susan | last18 = Chand | first18 = Meera | last19 = Ramsay | first19 = Mary | title = Effectiveness of Covid-19 Vaccines against the B.1.617.2 (Delta) Variant | journal = New England Journal of Medicine | year = 2021 | issn = 0028-4793 | doi = 10.1056/NEJMoa2108891| pmid = 34289274 | pmc = 8314739 | doi-access = free }}</ref>

== Rawatan ==
{{see also|Rawatan dan pengurusan COVID-19}}
Bamlanivimab mungkin tidak berkesan terhadap varian Delta sendiri, menurut ujian in vitro.<ref>{{cite journal|access-date=2021-07-30|author=Delphine Planas|date=2021-07-08|journal=Nature|title=Reduced sensitivity of SARS-CoV-2 variant Delta to antibody neutralization|pages=1–5|doi=10.1038/s41586-021-03777-9|pmid=34237773|url=https://www.nature.com/articles/s41586-021-03777-9}}</ref> Casirivimab, etesevimab, dan imdevimab nampaknya berkhasiat pada kepekatan yang cukup tinggi. Sotrovimab juga mungkin berkesan terhadap Delta, menurut kajian pra cetak.<ref>{{cite journal|access-date=2021-07-30|author=Andrea Cathcart|date=2021-07-26|title=The dual function monoclonal antibodies VIR-7831 and VIR-7832 demonstrate potent in vitro and in vivo activity against SARS-CoV-2|url=https://www.biorxiv.org/content/10.1101/2021.03.09.434607v5|journal=bioRxiv|doi=10.1101/2021.03.09.434607|s2cid=232223983}}</ref> Oksigen, [[remdesivir]], dan [[kortikosteroid]] tambahan telah digunakan pada lebih banyak pesakit varian Delta di Singapura daripada varian sebelumnya.<ref>{{cite document|access-date=2021-07-30|author=Sean Wei Xiang Ong|date=2021-06-07|title=Clinical and Virological Features of SARS-CoV-2 Variants of Concern: A Retrospective Cohort Study Comparing B.1.1.7 (Alpha), B.1.315 (Beta), and B.1.617.2 (Delta)|url=https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3861566|publisher=SSRN|ssrn=3861566}}</ref>

== Epidemiologi ==
{|class="wikitable floatright" style="width:300px;" 
|+Rumusan impak terhadap varian Delta'''*'''<br />(Kemas kini [[World Health Organization|WHO]], 20 Julai 2021<ref name="WHO-weekly-update-2021-07-20" />)
	![[Penularan penyakit|Penularan]]
	|Meningkatkan penularan dan kadar serangan sekunder
|-
	!Virulensi**
	|Meningkatkan risiko kemasukan ke hospital
|-
	!Jangkitan semula
	|Mengurangkan aktiviti peneutralan
|-
	!Diagnostik
	|Tiada impak yang dilaporkan 
|-
	|colspan=2|'''*''' {{small|Penemuan umum berbanding strain lain, berdasarkan bukti termasuk penerbitan yang tidak dikaji oleh rakan sebaya.}}<br>'''**''' {{small|Keupayaan patogen atau mikroorganisma untuk menyebabkan kerosakan kepada perumah.}}
|}

=== Penularan ===
Menurut pakar UK, varian Delta 40 hingga 60 peratus lebih mudah menular berbanding varian Alpha yang sebelumnya dominan, yang pada mulanya ditemui di UK (dikenali sebagai varian Kent). Memandangkan varian Alpha sudah 150 peratus dapat menular berbanding dengan strain Wuhan yang asal, dan jika Delta 150 peratus dapat menular berbanding dengan Alpha, Delta mungkin dapat menular 225 peratus berbanding dengan strain yang asli. [[BBC]] melaporkan bahawa nilai [[Jumlah pembiakan asas|<math>R_0</math>]]{{snd}}tahap kebolehjangkitan sesuatu virus, iaitu berapa ramai individu yang boleh dijangkiti oleh satu kes positif{{snd}}untuk virus Wuhan yang asal adalah antara 2.4 hingga 2.6, untuk Alpha 4 hingga 5, dan untuk Delta 5 hingga 9. Ini dapat dibandingkan dengan MERS (0.29 hingga 0.80), influenza bermusim (1.2 hingga 1.4), Ebola (1.4 hingga 1.8), selesema biasa (2 hingga 3), SARS (2 hingga 4), cacar (3.5 hingga 6), dan cacar air (10 hingga 12). Bahkan individu yang telah diberi vaksin rentan terhadap varian Delta kerana kadar penularan virus yang tinggi.<ref>{{Cite journal|last=Brown|first=Catherine M.|date=2021|title=Outbreak of SARS-CoV-2 Infections, Including COVID-19 Vaccine Breakthrough Infections, Associated with Large Public Gatherings — Barnstable County, Massachusetts, July 2021|url=https://www.cdc.gov/mmwr/volumes/70/wr/mm7031e2.htm|journal=MMWR. Morbidity and Mortality Weekly Report|language=en-us|volume=70|issue=31|pages=1059–1062|doi=10.15585/mmwr.mm7031e2|pmid=34351882|issn=0149-2195|doi-access=free}}</ref>

Menurut kajian<ref>{{cite web|last=Lu|first=Jing|date=2021-07-07|title=Viral infection and transmission in a large well-traced outbreak caused by the Delta SARS-CoV-2 variant|url=https://virological.org/t/viral-infection-and-transmission-in-a-large-well-traced-outbreak-caused-by-the-delta-sars-cov-2-variant/724|url-status=live|archive-url=https://web.archive.org/web/20210722180349/https://virological.org/t/viral-infection-and-transmission-in-a-large-well-traced-outbreak-caused-by-the-delta-sars-cov-2-variant/724|website=virological.org|archivedate=2021-07-22}}</ref> yang diterbitkan dalam talian oleh Pusat Pengawalan dan Pencegahan Penyakit Provinsi Guangdong, individu yang dijangkiti varian Delta memiliki 1,000 kali lebih banyak salinan virus di saluran pernafasan mereka berbanding mereka yang dijangkiti varian Wuhan, dan mengambil purata masa empat hari untuk orang yang dijangkiti varian Delta dapat dikesan.<ref>{{cite news | title = Why The Delta Variant Is Hyper-Contagious: A New Study Sheds Light | date = 2021-07-21 | url = https://www.npr.org/sections/goatsandsoda/2021/07/08/1013794996/why-the-delta-variant-is-so-contagious-a-new-study-sheds-light | work = [[NPR]]}}</ref><ref name=Forbes-2021-07-13>{{cite news | last1 = Haseltine | first1 = William A | author-link = William A. Haseltine | title = The Delta Dilemma: Loosening Covid-19 Controls At A Time Of Increased Danger | date = 2021-07-13 | url = https://www.forbes.com/sites/williamhaseltine/2021/07/13/the-delta-dilemma-loosening-covid-19-controls-at-a-time-of-increased-danger/ | work = [[Forbes]]}}</ref>

Menurut data pengawasan dari Amerika Syarikat, Jerman, dan Belanda, varian Delta membiak dengan faktor empat setiap dua minggu jika dibandingkan dengan varian Alpha.<ref>{{Cite web|title=CDC covid variant tracker|date=28 March 2020|url=https://covid.cdc.gov/covid-data-tracker/#variant-proportions|url-status=live |access-date=13 July 2021}}</ref><ref>{{Cite web|title=RIVM Covid variant tracker|url=https://www.rivm.nl/en/coronavirus-covid-19/virus-sars-cov-2/variants|url-status=live|access-date=13 July 2021}}</ref><ref name=":5">{{Cite web|title=RKI - Coronavirus SARS-CoV-2 - Berichte zu Virusvarianten von SARS-CoV-2 in Deutschland|url=https://www.rki.de/DE/Content/InfAZ/N/Neuartiges_Coronavirus/DESH/Berichte-VOC-tab.html|access-date=2021-06-19|website=www.rki.de}}</ref>

Varian Delta telah menjadi strain jangkitan yang dominan pada bulan Julai 2021 di India, United Kingdom, Portugal, Rusia, Mexico, Australia, Indonesia, Afrika Selatan, Jerman, Luxembourg, Amerika Syarikat, Belanda, Denmark, Perancis dan mungkin di beberapa negara lain.<ref>{{Cite web|date=2021-07-09|title=Delta variant to account for most new French COVID cases from this weekend - minister|url=https://www.reuters.com/world/europe/delta-variant-account-most-new-french-covid-cases-this-weekend-minister-2021-07-09/|access-date=2021-07-09|website=Reuters}}</ref> Biasanya terdapat selang tiga minggu antara kes dan pelaporan varian.  Pada 20 Julai, varian ini telah menular ke 124 negara, dan WHO telah memberi amaran bahawa varian ini akan menjadi strain yang dominan.

Selepas minggu ke-28 tahun 2021, virus masih dapat menular dengan cepat di Belanda, dengan lebih dari 93.4 peratus penderma darah disahkan positif untuk antibodi SARS-CoV-2. Ramai individu belum lagi divaksin sepenuhnya di negara tersebut.<ref>{{Cite web|title=Corona-antistoffen bij 93% van donors|url=https://www.sanquin.nl/over-sanquin/nieuws/2021/07/corona-antistoffen-bij-93-procent-van-donors|url-status=live|access-date=2021-07-29|website=Sanquin Netherlands|language=nl}}</ref>

=== Virulensi ===
Penyelidik dari Pusat Nasional Penyakit Berjangkit Singapura menerbitkan laporan pada 7 Jun 2021, yang mendakwa bahawa pesakit yang disahkan positif varian Delta lebih cenderung mengalami radang paru-paru dan/atau memerlukan bantuan oksigen berbanding pesakit yang positif varian Alpha.<ref>{{cite document | date = 2021-06-07 | title = Clinical and Virological Features of SARS-CoV-2 Variants of Concern: A Retrospective Cohort Study Comparing B.1.1.7 (Alpha), B.1.315 (Beta), and B.1.617.2 (Delta) | url = https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3861566 | publisher = SSRN | ssrn = 3861566 | archiveurl = https://web.archive.org/web/20210707183930/https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3861566 | archivedate = 2021-07-07| last1 = Ong | first1 = Sean Wei Xiang | last2 = Chiew | first2 = Calvin J. | last3 = Ang | first3 = Li Wei | last4 = Mak | first4 = Tze-Minn | last5 = Cui | first5 = Lin | last6 = Toh | first6 = Matthias Paul HS | last7 = Lim | first7 = Yi Ding | last8 = Lee | first8 = Pei Hua | last9 = Lee | first9 = Tau Hong | last10 = Chia | first10 = Po Ying | last11 = Maurer-Stroh | first11 = Sebastian | last12 = Lin | first12 = Raymond Tzer Pin | last13 = Leo | first13 = Yee-Sin | last14 = Lee | first14 = Vernon J. | last15 = Lye | first15 = David Chien | last16 = Young | first16 = Barnaby E. }}</ref>

Pada 11 Jun, Public Health England mengeluarkan sebuah penelitian yang mengungkapkan bahawa varian Delta mempunyai risiko kemasukan ke hospital jauh lebih tinggi berbanding varian Alpha.<ref>{{cite web|access-date=2021-07-22|author=Public Health England|date=2021-06-11|page=50|title=SARS-CoV-2 variants of concern and variants under investigation in England Technical briefing 15|url=https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/993879/Variants_of_Concern_VOC_Technical_Briefing_15.pdf|website=gov.uk}}</ref> Penyelidik Kesihatan Awam Scotland mendapati pada 14 Jun bahawa risiko pesakit dimasukkan ke hospital akibat varian Delta kira-kira dua kali ganda lebih tinggi berbanding varian Alpha.<ref>{{cite journal | last1 = Sheikh | first1 = Aziz | last2 = McMenamin | first2 = Jim | last3 = Taylor | first3 = Bob | last4 = Robertson | first4 = Chris | title = SARS-CoV-2 Delta VOC in Scotland: demographics, risk of hospital admission, and vaccine effectiveness | journal = The Lancet | volume = 397 | issue = 10293 | year = 2021 | pages = 2461–2462 | issn = 01406736 | doi = 10.1016/S0140-6736(21)01358-1| pmid = 34139198 | pmc = 8201647 }}</ref>

Pada 9 Julai, Public Health England melaporkan bahawa varian Delta mempunyai kadar kematian sebanyak 0.2 peratus di England sementara varian Alpha mencatatkan kadar kematian 1.9 peratus. Walaupun laporan tersebut memperingatkan bahawa kadar kematian tidak dapat dibandingkan di antara varian  kerana ianya memuncak pada titik yang berbeza dalam pandemik. Oleh itu, ianya berbeza dalam tekanan latar belakang hospital, ketersediaan vaksinasi, dan faktor lain.<ref name="voctech">{{cite web|date=2021-07-09|title=SARS-CoV-2 variants of concern and variants under investigation in England|url=https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1001358/Variants_of_Concern_VOC_Technical_Briefing_18.pdf|url-status=live|access-date=2021-07-19|website=assets.publishing.service.gov.uk|series=Public Health England Technical Briefing 18|pages=10–11, Table 3 and footnote 2 of that table|language=English}}{{OGL-attribution|version=3.0}}</ref> Jurucakap Kesihatan Awam England, James McCreadie, berkata bahawa ianya masih terlalu awal untuk membandingkan nisbah kematian kes dengan varian lain.<ref>{{cite web |last1=Kertscher |first1=Tom |title=Data showing lower death rate for coronavirus delta variant doesn't mean it's less dangerous |url=https://www.politifact.com/factchecks/2021/jul/07/instagram-posts/data-showing-lower-death-rate-coronavirus-delta-va/ |publisher=Politifact |access-date=20 July 2021 |date=7 July 2021}}</ref>

Jika dibandingkan dengan strain SARS-CoV-2 lain yang bukan varian yang membimbangkan (VOC), varian Delta mempunyai risiko kemasukan ke hospital 120 peratus, risiko kemasukan ke unit rawatan rapi (ICU) 287 peratus, dan risiko kematian 137 peratus lebih tinggi, menurut kajian pra cetak yang diterbitkan pada 12 Julai oleh ahli epidemiologi  di Universiti Toronto di Kanada.<ref>{{cite document|access-date=2021-07-22|date=2021-07-12|first1=David|first2=Ashleigh|last1=Fisman|last2=Tuite|title=Progressive Increase in Virulence of Novel SARS-CoV-2 Variants in Ontario, Canada|url=https://www.medrxiv.org/content/10.1101/2021.07.05.21260050v2|work=medRxiv|doi=10.1101/2021.07.05.21260050|s2cid=235756602}}</ref>

== Statistik ==
Setakat 22 Jun 2021, lebih daripada 4,500 turutan jujukan genom varian telah ditemui di 78 negara.<ref name="GISAID"/><ref name="WHO 11Mei">{{cite web|url=https://www.who.int/publications/m/item/weekly-epidemiological-update-on-covid-19---11-may-2021|title=Weekly epidemiological update on COVID-19 - 11 Mei 2021|date=11 Mei 2021 |website=World Health Organization|access-date=2021-07-27}}</ref><ref>{{Cite web|title=Weekly epidemiological update on COVID-19 - 22 Jun 2021|url=https://www.who.int/publications/m/item/weekly-epidemiological-update-on-covid-19---22-june-2021|access-date=2021-06-29|website=www.who.int|language=en}}</ref> Berikut adalah jumlah turutan yang dilaporkan di negara-negara di mana pengesanan telah dijumpai:

{|class="wikitable sortable" style="text-align: right"
|-
! colspan=5 | Jumlah kes mengikut negara
|-
! scope="col" | Negara/Kawasan
! scope="col" data-sort-type="number"| Kes yang disahkan varian Delta:<br />(PANGOLIN)<ref>{{Cite web|title=PANGO lineages Lineage B.1.617.2|url=https://cov-lineages.org/lineages/lineage_B.1.617.2.html|access-date=3 Ogos 2021|website=cov-lineages.org}}</ref> setakat 3 Ogos
! scope="col" data-sort-type="number"| Kes yang disahkan<br />([[GISAID]])<ref name="GISAID"/> setakat 4 Ogos
! scope="col" data-sort-type="number"| Kes (sumber-sumber lain)<br />setakat 6 Ogos 2021
! scope="col" | Pengesanan pertama
|-
| style="text-align: left" | {{flagu|United Kingdom}} || 175,569 || 194,790 || 324,192<ref>{{cite web |url=https://www.gov.uk/government/publications/covid-19-variants-genomically-confirmed-case-numbers|title=COVID-19 variants: genomically confirmed case numbers|access-date=30 Julai 2021|website=Gov.uk}}</ref> ||  22 Februari 2021
|-
| style="text-align: left | {{flagu|Amerika Syarikat}} ||  31,857 || 36,908 || 82.2% kes varian<ref>{{cite web|url=https://covid.cdc.gov/covid-data-tracker/#variant-proportions|title=Variant Proportions|access-date=30 Julai 2021|website=Cdc.gov|date=28 Mac 2020}}</ref> ||  23 Februari 2021
|-
| style="text-align: left | {{flagu|Fiji}} || - || - || (20,200 kes aktif COVID-19) <ref>Tidak diketahui berapa jumlahnya Delta.{{cite web|url=https://experience.arcgis.com/experience/db0cf0a2827d4c718a5a9ad823482028|title=Fiji Ministry of Health and Medical Services COVID-19 Cases|access-date=30 Julai 2021}}</ref><ref>{{cite web|url=https://www.fijivillage.com/news/506-new-COVID-19-cases-and-1-COVID-death-4x85rf/|title=Fiji COVID-19 update for 10 Julai 2021|date=10 Julai 2021 |website=Fiji Village News|access-date=10 Julai 2021}}</ref><ref>{{cite web|url=https://www.abc.net.au/news/2021-07-11/fiji-vaccination-refuses-lockdown-covid-outbreak-delta-strain/100268680|title=Fiji is racing against time to vaccinate its population while a COVID-19 outbreak explodes|date=10 Julai 2021 |website=ABC News|access-date=11 Julai 2021}}</ref> || 19 April 2021
|-
| style="text-align: left | {{flagu|India}} || 13,305 || 15,891 || ||  5 Oktober 2020
|-
| style="text-align: left | {{flagu|Denmark}} || 13,426 || 14,997 || || 8 Mac.2021
|-
| style="text-align: left | {{flagu|Kanada}} || 1,182 || 4,098 || 9,843<ref>{{cite web|date=4 Februari 2021|title=Tracking variants of the novel coronavirus in Canada|url=https://www.ctvnews.ca/health/coronavirus/tracking-variants-of-the-novel-coronavirus-in-canada-1.5296141|access-date=2021-07-30|website=Ctvnews.ca}}</ref> || 15 Mac 2021
|-
| style="text-align: left | {{flagu|Jepun}} || 533 || 861 || 1,583<ref>{{cite web|url=https://www.niid.go.jp/niid/ja/idwr-dl/2021.html|website=National Institute of Infectious Diseases|title=Infectious Diseases Weekly Report|access-date=30 Julai 2021}}</ref> L452R: 7,143<ref>{{cite web|url=https://www.mhlw.go.jp/stf/seisakunitsuite/newpage_00054.html|website=Ministry of Health, Labour and Welfare|title=都道府県別の懸念される変異株の国内事例数(ゲノム解析)について|access-date=30 Julai 2021}}</ref> || 28 Mac 2021
|-
| style="text-align: left | {{flagu|Jerman}} || 6,634 || 6,733 || || 1 Mac 2021
|-
| style="text-align: left | {{flagu|Itali}} || 4,585 || 5,117 || || 2 April 2021
|-
| style="text-align: left | {{flagu|Sepanyol}} || 4,003 || 4,542 || || 22 April 2021
|-
| style="text-align: left | {{flagu|Perancis}} || 3,948 || 4,099 || || 21 Februari 2021
|-
| style="text-align: left | {{flagu|Belgium}} || 3,385 || 3,458 || || 25 Mac 2021
|-
| style="text-align: left | {{flagu|Portugal}} || 3,004 || 3,177 || || 5 April 2021
|-
| style="text-align: left | {{flagu|Sweden}} || 2,873 || 4,579 || || 26 Mac 2021
|-
| style="text-align: left | {{flagu|Belanda}} || 4,404 || 4,491 || || 6 April 2021
|-
| style="text-align: left | {{flagu|Afrika Selatan}} || 1,629 || 1,952 || 4<ref>{{Cite web|title=Update On Covid-19 (08th Mei 2021) - SA Corona Virus Online Portal|url=https://sacoronavirus.co.za/2021/05/08/update-on-covid-19-08th-may-2021/|access-date=2021-05-10|website=SA Corona Virus Online Portal|language=en-ZA}}</ref> || 30 April 2021
|-
| style="text-align: left | {{flagu|Mexico}} || 1,559 || 2,079 || || 5 April 2021
|-
| style="text-align: left | {{flagu|Ireland}} || 2,706 || 2,793 || || 26 Februari 2021
|-  
| style="text-align: left | {{flagu|Singapura}} || 1,879 || 1,975 || ||  26 Februari 2021
|-
| style="text-align: left | {{flagu|Rusia}} || 1,456 || 1,594 || 16<ref>{{Cite news|title=Russia records first cases of COVID variant found in India|work=The Economic Times|url=https://economictimes.indiatimes.com/news/international/world-news/russia-records-first-cases-of-covid-variant-found-in-india/articleshow/82598450.cms|access-date=2021-05-13}}</ref>|| 21 April 2021
|-
| style="text-align: left | {{flagu|Indonesia}} || 961 || 1,222 || || 3 April 2021
|-
| style="text-align: left | {{flagu|Switzerland}} || 1,777 || 2,081 || || 29 Mac 2021
|-
| style="text-align: left | {{flagu|Israel}} || 1,690 || 1,801 || 41<ref>{{cite web |last1=Soni |first1=Parul |title=Israel Is The Most Vaccinated Country, But The B.1.617 Is Threatening It Now |url=https://www.ibtimes.com/israel-most-vaccinated-country-b1617-threatening-it-now-3191008 |website=International Business Times |publisher=IBT Media |date=30 April 2021}}</ref><ref>{{cite web|url=https://www.reuters.com/world/india/israel-logs-indian-covid-19-variant-sees-some-vaccine-efficacy-against-it-2021-04-20/|title=Israel logs Indian COVID-19 variant, sees some vaccine efficacy against it|date=20 April 2021 |website=[[Reuters]]|access-date=24 April 2021}}</ref><ref>{{Cite web|title=זוהו 41 מקרים של הזן (הווריאנט) ההודי, מתוכם 24 חוזרים מחו"ל |trans-title=41 cases of the Indian variety have been identified, of which 24 are from abroad |url=https://www.gov.il/he/departments/news/29042021-01|access-date=29 April 2021|website=GOV.IL|language=he}}</ref>|| 16 April 2021
|-
| style="text-align: left | {{flagu|Australia}} || 907 || 1,698 || 332<ref>{{cite web|url=https://www.cdgn.org.au/variants-of-concern|website=Communicable Disease Genomes Network|title=Variants of Concern|access-date=2021-05-13}}</ref> || 16 Mac 2021
|-
| style="text-align: left | {{flagu|Turki}} || 776 || 776 || 5<ref>{{cite web|url=https://www.theguardian.com/world/live/2021/apr/28/coronavirus-live-news-india-us-uk-biden-fauci-virus-risk-vaccine-delhi-covid-cases?page=with:block-6089836a8f084ed0b756947a#block-6089836a8f084ed0b756947a|title=Coronavirus live news, 16:54, 28 April 2021 |date=28 April 2021 |website=The Guardian|access-date=28 April 2021}}</ref> || 28 April 2021
|-
| style="text-align: left | {{flagu|Austria}} || 939 || 1,360 ||  || 17 April 2021
|-
| style="text-align: left | {{flagu|Norway}} || 347 || 764 || 1<ref>{{cite web|url=https://www.dagbladet.no/studio/nyhetsstudio/5?post=61774|title=Indisk virusvariant påvist i Norge |trans-title=Indian virus variant detected in Norway |date=16 April 2021 |website=dagbladet.no|access-date=28 April 2021}}</ref> || 15 April 2021
|-
| style="text-align: left | {{flagu|Botswana}} || - || 239 || 2<ref>{{cite web|title=Botswana confirms new COVID-19 variant|url=https://www.weekendpost.co.bw/31284/news/botswana-confirms-new-covid-19-variant/|website=Weekend Post|access-date=18 Mei 2021|date=17 Mei 2021}}</ref> || 28 April 2021
|-
| style="text-align: left | {{flagu|Bangladesh}} || 43 || 255 || 9<!-- Jessore: 4, Dhaka: 4, Narail: 1. Total Death: 1, Recoveries: 5 --><ref>{{Cite web|date=2021-05-17|title=IEDCR: Indian Covid variant found in six Bangladeshis|url=https://www.dhakatribune.com/bangladesh/2021/05/17/iedcr-indian-variant-found-in-six-bangladeshis|access-date=2021-05-18|website=Dhaka Tribune}}</ref><ref>{{Cite web|date=2021-05-18|title=যশোরে আরো ৩জনের শরীরে করোনার ভারতীয় ভ্যারিয়েন্ট শনাক্ত|trans-title=Indian variant of coronavirus identified in 3 more poeple in [[Jessore District]]|url=https://www.youtube.com/watch?v=JA9OnDNdC7c|access-date=2021-05-18|website= Youtube|publisher=Jamuna TV }}</ref>|| 28 April 2021
|-
| style="text-align: left | {{flagu|Qatar}} || - || 180 || || 19 April 2021
|-
| style="text-align: left | {{flagu|Republik Demokratik Congo}} ||  - || 228 || 5<ref name="AfrNews 13Mei">{{cite web|url=https://www.africanews.com/2021/05/13/nigeria-algeria-report-indian-variant-of-the-coronavirus-who-says-without-further-details/|title=Nigeria, Algeria report Indian variant of the coronavirus, WHO says without further details |date=13 Mei 2021 |website=africanews.com|access-date=14 Mei 2021}}</ref> || 3 Mei 2021
|-
| style="text-align: left | {{flagu|Finland}} || 1,199 || 1,200 || 60<ref name="YLE1" /><ref>{{cite web|url=https://yle.fi/uutiset/3-11923776|title=Intialaiseen muunnokseen on sairastunut Suomessa kymmenkunta henkeä – Uudenmaan koronaviruskanta on vaihtunut täysin alkuvuoden aikana |date=10 Mei 2021 |website=yle.fi|access-date=17 Mei 2021 | trans-title=About a dozen people in Finland have contracted the Indian variant - the coronavirus variants seen in Uusimaa have completely changed in the first part of the year | language=Finnish }}</ref><ref>{{cite news |author=<!--Staff writer(s)/no by-line.--> |title=Virologist: Indian variant not major concern in Finland, though care should be taken |url=https://yle.fi/uutiset/osasto/news/virologist_indian_variant_not_major_concern_in_finland_though_care_should_be_taken/11950617 |work=[[Yle]] |location=Finland |date=27 Mei 2021 |access-date=2021-05-27}}</ref> || 18 Mac 2021
|-
| style="text-align: left | {{flagu|Poland}} || 82 || 316 || 16<ref>{{cite web|url=https://tvn24.pl/polska/koronawirus-w-polsce-indyjska-mutacja-koronawisa-dwa-nowe-ogniska-5084942|title=Minister zdrowia: mamy kolejne dwa ogniska związane z mutacją indyjską koronawirusa|trans-title=Health Minister: We have two more outbreaks related to the Indian mutation of the coronavirus|date=4 Mei 2021|language=polish|website=tvn24.pl|access-date=4 Mei 2021}}</ref> || 26 April 2021
|-
| style="text-align: left | {{flagu|Thailand}} || 94 || 188 || 2<ref>{{Cite web|title=Indian variant of Covid-19 confirmed in Thailand | url=https://www.bangkokpost.com/thailand/general/2113295/indian-variant-of-covid-19-confirmed-in-thailand|date=10 Mei 2021|access-date=11 Mei 2021|website=Bangkok Post}}</ref> || 24 April 2021
|-
| style="text-align: left | {{flagu|Nepal}} ||  - || 134 || 9<ref>{{Cite web|title=Nepal reports more Covid-19 deaths and record daily new infections | url=https://kathmandupost.com/health/2021/05/11/nepal-reports-more-covid-19-deaths-and-record-daily-new-infections|date=11 Mei 2021|access-date=11 Mei 2021|website=Kathmandu Post}}</ref> || 28 April 2021
|-
| style="text-align: left | {{flagu|Luxembourg}} ||  51 || 780 || || 15 April 2021
|-
| style="text-align: left | {{flagu|China}} || - || 217 || || 24 April 2021 
|-
| style="text-align: left | {{flagu|Bahrain}} ||  - || 116 || ||  5 April 2021
|-
| style="text-align: left | {{flagu|New Zealand}} ||  - || 94 || || 9 Mac 2021 
|-
| style="text-align: left | {{flagu|Angola}} ||  - || 27 || || 14 Januari 2021 
|-
| style="text-align: left | {{flagu|Hong Kong}} ||  - || 10 || || 22 April 2021
|-
| style="text-align: left | {{flagu|Korea Selatan}} ||  - || 488 || || 26 Mac 2021
|-
| style="text-align: left | {{flagu|Jordan}} ||  - || 5 || || 21 April 2021
|-
| style="text-align: left | {{flagu|Republik Czech}} ||  - || 409 || || 24 April 2021 
|-
| style="text-align: left | {{flagu|Greece}} ||  - || 17 || || 23 Mac 2021
|-
| style="text-align: left | {{flagu|Guadeloupe}} ||  - || 5 || || 10 Mac 2021
|-
| style="text-align: left | {{flagu|Argentina}} ||  - || 1 || 2<ref>{{Cite web|title=Cases of South African and Indian coronavirus strains detected in Argentina| url=https://en.mercopress.com/2021/05/11/cases-of-south-african-and-indian-coronavirus-strains-detected-in-argentina|date=11 Mei 2021|access-date=11 Mei 2021|website=MercoPress}}</ref> || 24 April 2021
|-
| style="text-align: left | {{flagu|Morocco}} ||  - || 2 || 2<ref>{{Cite web|last=Yabiladi.com|title=Morocco : Two cases of the Indian variant of Covid-19 confirmed in Casablanca|url=https://en.yabiladi.com/articles/details/109351/morocco-cases-indian-variant-covid-19.html|access-date=2021-05-03|website=en.yabiladi.com|language=fr}}</ref>
|3 Mei 2021
|-
| style="text-align: left | {{flagu|Sint Maarten}} ||  - || 22 || || 19 Mac 2021
|-
| style="text-align: left | {{flagu|Algeria}} ||  - || 6 || 6<ref>{{cite web|url=https://www.reuters.com/business/healthcare-pharmaceuticals/algeria-finds-first-cases-indian-coronavirus-variant-2021-05-03/|title=Algeria finds first cases of Indian coronavirus variant |date=4 Mei 2021 |website=Reuters|access-date=14 Mei 2021}}</ref> || April 2021
|-
| style="text-align: left | {{flagu|Aruba}} ||  - || 54 || || 16 April 2021
|-
| style="text-align: left | {{flagu|Kemboja}} ||  - || 115 || || 5 April 2021
|-
| style="text-align: left | {{flagu|Curacao}} ||  - || 32 || || 23 April 2021
|-
| style="text-align: left | {{flagu|Cyprus}} ||  - || - || 4<ref>{{cite web|url=https://www.reuters.com/article/health-coronavirus-cyprus-variant/cyprus-finds-first-cases-of-indian-covid-variant-idUSL5N2N62EX|title=Cyprus finds first cases of Indian COVID variant |date=19 Mei 2021 |website=Reuters|access-date=19 Mei 2021}}</ref> || 19 Mei 2021
|-
| style="text-align: left | {{flagu|Haiti}} ||  - || - || (angka tidak dilaporkan)<ref name="WHO 18Mei">{{cite web|url=https://www.who.int/publications/m/item/weekly-epidemiological-update-on-covid-19---18-may-2021|title=Weekly epidemiological update on COVID-19 - 18 Mei 2021|date=18 Mei 2021 |website=World Health Organization|access-date=19 Mei 2021}}</ref> ||
|-
| style="text-align: left | {{flagu|Iran}} ||  - || 11 || 3<ref>{{cite web|url=https://english.alarabiya.net/coronavirus/2021/05/05/Iran-reports-three-cases-of-Indian-coronavirus-variant|title=Iran reports three cases of Indian coronavirus variant |date=5 Mei 2021 |website=Al Arabiya|access-date=14 Mei 2021}}</ref> || 11 Mei 2021
|-
| style="text-align: left | {{flagu|Kenya}} ||  - || 478 || 5<ref name="AfrNews 13Mei"/><ref>{{cite web|url=https://www.ndtv.com/world-news/covid-indian-variant-detected-in-kenya-2429121|title=Covid Indian Variant Detected In Kenya |date=5 Mei 2021 |website=ndtv.com|access-date=7 Mei 2021}}</ref> || Mei 2021
|-
| style="text-align: left | {{flagu|Kyrgyzstan}} || - || - || (angka tidak dilaporkan)<ref name="WHO 18Mei"/> ||
|-
| style="text-align: left | {{flagu|Malaysia}} ||  - || 88 || || 10 April 2021
|-
| style="text-align: left | {{flagu|Nigeria}} ||  - || 15 || 1<ref name="AfrNews 13Mei"/> || Mei 2021
|-
| style="text-align: left | {{flagu|Panama}} ||  - || - || 1<ref>{{cite web|url=https://menafn.com/1102050176/First-case-of-Indian-variant-detected-at-Tocumen-International|title=First case of Indian variant detected at Tocumen International |date=8 Mei 2021 |website=ndtv.com|access-date=14 Mei 2021}}</ref> || April 2021
|-
| style="text-align: left | {{flagu|Romania}} ||  - || 95 ||  || 26 April 2021 
|-
| style="text-align: left | {{flagu|Reunion}} ||  - || 32 ||  || 4 Mei 2021
|-
| style="text-align: left | {{flagu|Slovenia}} || - || 234 ||  || 20 April 2021
|-
| style="text-align: left | {{flagu|Sri Lanka}} ||  - || 66 || 1<ref>{{Cite web|title=Covid-19 Indian variant spreads to neighbouring countries; detected in Sri Lanka, Bangladesh | url=https://timesofindia.indiatimes.com/world/south-asia/covid-19-indian-variant-spreads-to-neighbouring-countries-detected-in-sri-lanka-bangladesh/articleshow/82482702.cms|date=8 Mei 2021|access-date=11 Mei 2021|website=Times of India}}</ref> || 30 April 2021
|-
| style="text-align: left | {{flagu|Uganda}} ||  - || 134 || 1<ref>{{cite web|url=https://www.reuters.com/world/africa/raising-fears-covid-surge-uganda-detects-indian-variant-official-says-2021-04-30/|title=Raising fears of COVID surge, Uganda detects Indian variant, official says |date=30 April 2021 |website=Reuters|access-date=8 Mei 2021}}</ref> || 26 Mac 2021
|-
| style="text-align: left | {{flagu|Filipina}} ||  - || 13 || 450<ref>{{Cite news|date=Julai 29, 2021|last=Ornedo|first=Julia Mari|title=Philippines reports 97 more Delta variant cases; total now 216|url=https://www.gmanetwork.com/news/news/nation/797326/philippines-reports-97-more-delta-variant-cases-total-up-to-216/story/|work=GMA News|access-date=Julai 29, 2021}}</ref><ref>{{Cite news|date=Ogos 5, 2021|last=Gonzales|first=Cathrine|title=DOH reports 116 more COVID-19 Delta variant cases; total now at 331
|url=https://newsinfo.inquirer.net/1469599/doh-reports-116-more-covid-19-delta-variant-cases-total-now-at-331|work=Inquirer.net|access-date=Ogos 5, 2021}}</ref><ref>{{Cite news|date=Ogos 6, 2021|last=Domingo|first=Katrina|title=Philippines' confirmed Delta cases rise to 450
|url=https://news.abs-cbn.com/news/08/06/21/philippines-covid-delta-cases-now-at-450|work=ABS-CBN|access-date=Ogos 6, 2021}}</ref>|| 11 Mei 2021
|-
| style="text-align: left | {{flagu|Uzbekistan}} ||  - || - || (angka tidak dilaporkan)<ref name="WHO 18Mei"/> ||
|-
| style="text-align: left | {{flagu|Vietnam}} ||  54 || 113 || 12<ref>{{cite web|url=https://tuoitrenews.vn/news/society/20210502/vietnam-detects-double-mutant-indian-variant-of-coronavirus-for-1st-time/60677.html|title=Vietnam detects 'double mutant' Indian variant of coronavirus for 1st time |date=2 Mei 2021 |website=tuoitrenews.vn|access-date=17 Mei 2021}}</ref><ref>{{cite web|url=https://vietnamnews.vn/society/945877/indian-coronavirus-variant-found-in-covid-19-cases-linked-to-national-hospital-for-tropical-diseases.html|title=Indian coronavirus variant found in COVID-19 cases linked to National Hospital for Tropical Diseases |date=11 Mei 2021 |website=vietnamnews.vn|access-date=17 Mei 2021}}</ref> || 18 April 2021
|-
| style="text-align: left | {{flagu|Brazil}} ||  - || 129 || 465 <ref>[https://g1.globo.com/sp/sao-paulo/noticia/2021/05/26/sp-identifica-primeiro-caso-de-variante-do-coronavirus-em-passageiro-vindo-da-india.ghtml?utm_source=twitter&utm_medium=social&utm_campaign=g1 SP identifica primeiro caso de variante do coronavírus em passageiro vindo da Índia] 26/05/2021 ''g1.globo.com'', accessed 26 Mei 2021</ref><ref>[https://pebmed.com.br/covid-19-maranhao-registra-primeiros-casos-da-variante-indiana/ Covid-19: Maranhão registra primeiros casos da variante indiana] 21 Mei 2021 ''pebmed.com.br'', accessed 26 Mei 2021</ref> || 20 Mei 2021<ref>{{cite news |last1=Barbosa |first1=Alex |title=Identificação da variante indiana do coronavírus coincide com aumento de internações no Maranhão |url=https://g1.globo.com/ma/maranhao/noticia/2021/05/24/identificacao-da-variante-indiana-do-coronavirus-coincide-com-aumento-de-internacoes-no-maranhao.ghtml |work=g1.globo.com |publisher=TV Mirante e G1 MA |date=24 Mei 2021 |language=pt-br}}</ref><ref>[https://g1.globo.com/pr/norte-noroeste/noticia/2021/06/02/coronavirus-primeiro-caso-da-variante-indiana-e-confirmado-no-parana-diz-sesa.ghtml Coronavírus: Primeiro caso da variante indiana é confirmado no Paraná, diz Sesa] (''tr. "Coronavirus: First case of the Indian variant is confirmed in Paraná, says Sesa "'') 02/06/2021 ''g1.globo.com'', accessed 3 Jun 2021</ref><ref>[https://g1.globo.com/google/amp/go/goias/noticia/2021/06/18/variante-delta-do-coronavirus-e-identificada-e-tem-transmissao-comunitaria-em-goiania.ghtml Variante delta do coronavírus é identificada e tem transmissão comunitária em Goiânia] ''g1.globo.com'', accessed 23 Jun 2021</ref> <ref>https://www.correiodopovo.com.br/not%C3%ADcias/geral/casos-da-variante-delta-podem-estar-subnotificados-no-brasil-1.669503</ref>
|-
| style="text-align: left" | {{flagu|Guam}} ||  - || 1 ||  || 26 April 2021
|-
| style="text-align: left" | {{flagu|Ghana}} ||  - || 17 ||  || 20 April 2021
|-
| style="text-align: left" | {{flagu|Pakistan}} ||  - || 28 ||  || 16 Mei 2021
|-
| style="text-align: left" | {{flagu|Lithuania}} ||  - || 121 || 1<ref>{{cite web|url=https://www.lrt.lt/en/news-in-english/19/1434473/lithuania-detects-first-case-of-coronavirus-delta-variant-from-india|title=Lithuania detects first case of coronavirus Delta variant from India |date=17 Jun 2021 |website=lrt.lt/en/news-in-english|access-date=17 Jun 2021}}</ref> || 17 Jun 2021
|-
| style="text-align: left" | {{flagu|Croatia}} ||  - || 372 || || 11 Jun 2021
|-
| style="text-align: left" | {{flagu|Monaco}} ||  - || 34 || || 15 Mei 2021
|-
| style="text-align: left" | {{flagu|Malawi}} ||  - || 16 ||  || 30 April 2021
|-
| style="text-align: left" | {{flagu|Slovakia}} ||  - || 158 || || 15 Jun 2021
|-
| style="text-align: left" | {{flagu|Myanmar}} ||  - || 5 ||  || 1 Jun 2021
|-
| style="text-align: left" | {{flagu|Barbados}} ||  - || 6 ||  || 24 Mei 2021
|-
| style="text-align: left" | {{flagu|Kuwait}} ||  - || 119 ||  || 5 Jun 2021
|-
| style="text-align: left" | {{flagu|Georgia}} ||  - || 19 ||  || 15 Mei 2021
|-
| style="text-align: left" | {{flagu|Malta}} ||  - || 63 ||  || 23 Jun 2021
|-
| style="text-align: left" | {{flagu|Senegal}} ||  - || 28 ||  || 6 Mei 2021
|-
| style="text-align: left" | {{flagu|Peru}} ||  - || 2 ||  || 10 Jun 2021
|-
| style="text-align: left" | {{flagu|Mauritius}} ||  - || 5 ||  || 8 Mei 2021
|-
| style="text-align: left" | {{flagu|Chile}} ||  - || 28 ||  || 13 Jun 2021
|-
| style="text-align: left" | {{flagu|Taiwan}} ||  - || 3 ||  || 14 Jun 2021
|-
| style="text-align: left" | {{flagu|Bulgaria}} || - || 122 ||  || 5 April 2021
|-
| style="text-align: left" | {{flagu|Anguilla}} || - || 1 ||  || 20 April 2021
|-
| style="text-align: left" | {{flagu|Albania}} || - || 11 ||  || 13 Julai 2021
|-
| style="text-align: left" | {{flagu|Azerbaijan}} || - || 1 ||  || 14 Julai 2021
|-
| style="text-align: left" | {{flagu|Bosnia dan Herzegovina}} || - || 28 ||  || 26 Julai 2021
|-
| style="text-align: left" | {{flagu|Bonaire}} || - || 5 ||  || 13 Julai 2021
|-
| style="text-align: left" | {{flagu|Burundi}} || - || 3 ||  || 31 Mei 2021
|-
| style="text-align: left" | {{flagu|Colombia}} || - || 1 ||  || 3 Julai 2021
|-
| style="text-align: left" | {{flagu|Costa Rica}} || - || 13 ||  || 7 Julai 2021
|-
| style="text-align: left" | {{flagu|Krimea}} || - || 21 ||  || 1 Julai 2021
|-
| style="text-align: left" | {{flagu|Ecuador}} || - || 18 ||  || 20 Julai 2021
|-
| style="text-align: left" | {{flagu|Gambia}} || - || 80 ||  || 12 Julai 2021
|-
| style="text-align: left" | {{flagu|Guiana Perancis}} || - || 3 ||  || 22 Julai 2021
|-
| style="text-align: left" | {{flagu|Kosovo}} || - || 2 ||  || 2 Mei 2021
|-
| style="text-align: left" | {{flagu|Latvia}} || - || 22 ||  || 27 Mei 2021
|-
| style="text-align: left" | {{flagu|Lubnan}} || - || 28 ||  || 3 Julai 2021
|-
| style="text-align: left" | {{flagu|Maldives}} || - || 7 ||  || Jun 2021
|-
| style="text-align: left" | {{flagu|Moldova}} || - || 11 ||  || 6 Julai 2021
|-
| style="text-align: left" | {{flagu|Namibia}} || - || 16 ||  || Jun 2021
|-
| style="text-align: left" | {{flagu|Makedonia Utara}} || - || 7 ||  || 11 Julai 2021
|-
| style="text-align: left" | {{flagu|Oman}} || - || 8 ||  || 17 Mei 2021
|-
| style="text-align: left" | {{flagu|Paraguay}} || - || 6 ||  || 8 Julai 2021
|-
| style="text-align: left" | {{flagu|Serbia}} || - || 5 ||  || 6 Julai 2021
|-
| style="text-align: left" | {{flagicon|Sweden}} Daerah Södermanland, Sweden || - || 1 ||  || 7 Julai 2021
|-
| style="text-align: left" | {{flagu|Sudan Selatan}} || - || 4 ||  || 7 Jun 2021
|-
| style="text-align: left" | {{flagu|Tunisia}} || - || 1 ||  || 21 Mei 2021
|-
| style="text-align: left" | {{flagu|United Arab Emirates}} || - || 2 ||  || 23 Jun 2021
|-
| style="text-align: left" | {{flagu|Ukraine}} || - || 3 ||  || 24 Jun 2021
|-
| style="text-align: left" | {{flagicon|Sweden}} Daerah Västra Götaland, Sweden || - || 86 ||  || 19 Julai 2021
|-
| style="text-align: left" | {{flagu|Zambia}} || - || 82 ||  || 29 Mei 2021
|- class="sortbottom"
| style="text-align: left" |'''Dunia''' (118 negara) ||  Jumlah: '''287,586'''<br><small>(hanya B.1.617.2)</small>||  Jumlah: '''331,321'''<br><small>(B.1.617.2+AY.1+AY.2+AY.3)</small>||  Jumlah: '''336,619''' || 
|}
== Lihat juga ==
{{Portal|Covid-19}}
*[[Varian Alpha SARS-CoV-2]]
*[[Varian Beta SARS-CoV-2]]
*[[Varian Gamma SARS-CoV-2]]
*[[Varian Theta SARS-CoV-2]]
*[[Varian Iota SARS-CoV-2]]
*[[Varian Kappa SARS-CoV-2]]

== Rujukan ==
{{reflist}}

==Pautan luar==
* [https://www.gov.uk/government/publications/covid-19-variants-genomically-confirmed-case-numbers/variants-distribution-of-cases-data#Variant11 Public Health England: Variants of concern or under investigation, B.1.617]
{{Authority control}}

[[Kategori:Varian SARS-CoV-2]]
[[Kategori:Pandemik COVID-19 di India]]