Research and analysis

Investigation of SARS-CoV-2 variants of concern: variant risk assessments

Risk assessments for SARS-CoV-2 variants.

• From: UK Health Security Agency
• Published: 13 May 2021
• Last updated: 1 September 2023
  Show all updates

  1. 1 September 2023

     Added situational assessment for V-23AUG-01 (BA.2.86).

  2. 18 August 2023

     Added assessment for V-23AUG-01 (BA.2.86).

  3. 12 December 2022

     Added risk assessment for SARS-CoV-2 variants V-22OCT-01 (BQ.1) and sublineages, and V-22OCT-02 (XBB).

  4. 24 June 2022

     Added 22 June update for VOC-22APR-03 (Omicron BA.4) and VOC-22APR-04 (Omicron BA.5).

  5. 6 May 2022

     Added 28 April risk assessment for SARS-CoV-2 variants V-22APR-03 (Omicron BA.4) and V-22APR-04 (Omicron BA.5).

  6. 25 March 2022

     Added 23 March 2022 risk assessment for SARS-CoV-2 variant VUI-22JAN-01 (BA.2).

  7. 25 February 2022

     Added 23 February assessment for SARS-CoV-2 variant: VUI-22JAN-01 (BA.2).

  8. 11 February 2022

     Added 9 February assessment for SARS-CoV-2 variant: VUI-22JAN-01 (BA.2).

  9. 28 January 2022

     Added risk assessment for SARS-CoV-2 variant: VUI-22JAN-01 (BA.2).

  10. 14 January 2022

      Added 12 January risk assessment for Omicron variant.

  11. 23 December 2021

      Added 22 December risk assessment for Omicron variant.

  12. 17 December 2021

      Added 15 December risk assessment for Omicron variant.

  13. 10 December 2021

      Added 9 December risk assessment for Omicron variant.

  14. 8 December 2021

      Added 8 December risk assessment for Omicron variant.

  15. 3 December 2021

      Added risk assessment for SARS-CoV-2 variant: Omicron VOC-21NOV-01 (B.1.1.529).

  16. 12 November 2021

      Added risk assessment for SARS-CoV-2 variant: VUI-21OCT-01 AY.4.2.

  17. 6 August 2021

      Added risk assessment for SARS-CoV-2 variant VUI-21JUL-01.

  18. 23 July 2021

      Updated risk assessment for Delta and Beta variants.

  19. 9 July 2021

      Updated risk assessment for Delta and added new risk assessment for Lambda.

  20. 25 June 2021

      Updated risk assessment.

  21. 18 June 2021

      Updated risk assessment.

  22. 11 June 2021

      Updated risk assessment.

  23. 3 June 2021

      Updated risk assessment document and changed variant name to 'Delta'.

  24. 27 May 2021

      Updated risk assessment.

  25. 22 May 2021

      Added updated versions of both documents.

  26. 13 May 2021

      First published.

Applies to England

Documents

Situational assessment for SARS-CoV-2 variant V-23AUG-01 (BA.2.86)

Ref: UKHSA publication gateway number GOV-15367

HTML

Risk assessment for SARS-CoV-2 variant V-23AUG-01 (BA.2.86)

Ref: UKHSA publication gateway number GOV-15304

HTML

Risk assessment for SARS-CoV-2 variants V-22OCT-01 (BQ.1) and sublineages, and V-22OCT-02 (XBB)

Ref: UKHSA publication gateway number GOV-13850

PDF, 110 KB, 1 page

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Risk assessment for SARS-CoV-2 variants VOC-22APR-03 (Omicron BA.4) and VOC-22APR-04 (Omicron BA.5)

Ref: UKHSA publication gateway number GOV-12584

PDF, 85.6 KB, 1 page

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Risk assessment for SARS-CoV-2 variants V-22APR-03 (Omicron BA.4) and V-22APR-04 (Omicron BA.5)

Ref: UKHSA publication gateway number GOV-12145

PDF, 85.2 KB, 1 page

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Risk assessment for SARS-CoV-2 variant: VUI-22JAN-01 (BA.2): 23 March

Ref: UKHSA publication gateway number GOV-11784

PDF, 80.1 KB, 1 page

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Risk assessment for SARS-CoV-2 variant: VUI-22JAN-01 (BA.2): 23 February

Ref: GOV-11465

PDF, 96 KB, 1 page

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Risk assessment for SARS-CoV-2 variant: VUI-22JAN-01 (BA.2): 9 February

Ref: UKHSA publication gateway number GOV-11363

PDF, 79.8 KB, 1 page

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Risk assessment for SARS-CoV-2 variant: VUI-22JAN-01 (BA.2): 26 January 2022

Ref: UKHSA publication gateway number GOV-11218

PDF, 79.6 KB, 1 page

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Risk assessment for SARS-CoV-2 variant Omicron: VOC-21NOV-01 (B.1.1.529): 12 January 2022

Ref: UKHSA publication gateway number GOV-10945

PDF, 83.2 KB, 1 page

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Risk assessment for SARS-CoV-2 variant Omicron: VOC-21NOV-01 (B.1.1.529): 22 December 2021

Ref: UKHSA publication gateway number GOV-10869

PDF, 81 KB, 1 page

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Risk assessment for SARS-CoV-2 variant Omicron: VOC-21NOV-01 (B.1.1.529): 15 December 2021

Ref: UKHSA publication gateway number GOV-10761

PDF, 78.8 KB, 1 page

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Risk assessment for SARS-CoV-2 variant Omicron: VOC-21NOV-01 (B.1.1.529): 9 December 2021

Ref: UKHSA publication gateway number GOV-10654

PDF, 77.5 KB, 1 page

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Risk assessment for SARS-CoV-2 variant Omicron: VOC-21NOV-01 (B.1.1.529): 8 December 2021

Ref: UKHSA publication gateway number GOV-10659

PDF, 99.3 KB, 1 page

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Risk assessment for SARS-CoV-2 variant: Omicron VOC-21NOV-01 (B.1.1.529): 3 December 2021

Ref: UKHSA publication gateway number GOV-10548

PDF, 80.3 KB, 1 page

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Risk assessment for SARS-CoV-2 variant: VUI-21OCT-01 AY.4.2: 10 November 2021

Ref: UKHSA publication gateway number GOV-10376

PDF, 128 KB, 1 page

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Risk assessment for SARS-CoV-2 variant VUI-21JUL-01 (B.1.621): 6 August 2021

Ref: PHE publications gateway number: GOV-9245

PDF, 151 KB, 1 page

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Risk assessment for SARS-CoV-2 variant Delta: 23 July 2021

PDF, 69.4 KB, 1 page

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Risk assessment for SARS-CoV-2 variant Beta: 23 July 2021

PDF, 68.5 KB, 1 page

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Risk assessment for SARS-CoV-2 variant Delta: 8 July 2021

Ref: PHE publications gateway number: GOV-8894

PDF, 157 KB, 1 page

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Risk assessment for SARS-CoV-2 variant Lambda: 8 July 2021

Ref: PHE publications gateway number: GOV-8894

PDF, 186 KB, 1 page

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Risk assessment for SARS-CoV-2 variant Delta: 25 June

Ref: PHE publications gateway number: GOV-8717

PDF, 133 KB, 1 page

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SARS-CoV-2 variants: risk assessment framework

Ref: PHE publications gateway number: GOV-8426

PDF, 140 KB, 1 page

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Risk assessment for SARS-CoV-2 variant Delta: 18 June

Ref: PHE publications gateway number: GOV-8664

PDF, 136 KB, 1 page

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Risk assessment for SARS-CoV-2 variant Delta: 10 June

Ref: PHE publications gateway number: GOV-8578

PDF, 136 KB, 1 page

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Risk assessment for SARS-CoV-2 variant Delta: 3 June

Ref: PHE publications gateway number: GOV-8546

PDF, 75.3 KB, 1 page

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Risk assessment for SARS-CoV-2 variant VOC-21APR-02 (B.1.617.2): 27 May 2021

Ref: PHE publications gateway number: GOV-8439

PDF, 108 KB, 1 page

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Risk assessment for SARS-CoV-2 variant VOC-21APR-02 (B.1.617.2): 22 May 2021

Ref: PHE publications gateway number: GOV-8426

PDF, 115 KB, 1 page

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Details

See technical briefings and SARS-CoV-2 variant data update.