Research and analysis

Avian influenza (influenza A H5N1): risk to human health

Risk assessments on the investigation into the risk to human health of avian influenza (influenza A H5N1) in England.

• From: UK Health Security Agency
• Published: 29 November 2022
• Last updated: 25 July 2024 — See all updates

Applies to England

Documents

Technical risk assessment and evidence review as of 17 July 2024 of Influenza A(H5N1) 2.3.4.4b: US cattle outbreak update

Ref: GOV-17026

PDF, 456 KB, 11 pages

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Technical risk assessment as of 16 May 2024 Influenza A(H5N1) 2.3.4.4b: US cattle outbreak

Ref: GOV-16700

PDF, 468 KB, 12 pages

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Technical risk assessment as of 30 January 2023 for avian influenza (human health): influenza A H5N1 2.3.4.4b

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Technical risk assessment for avian influenza (human health): influenza A H5N1 2.3.4.4b

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Details

A record number of cases of avian influenza virus infections or ‘bird flu’ were confirmed across England, Scotland, and Wales in wild and captive birds last winter (2021 to 2022).

As we head into winter 2022 to 2023 there have been further increases in detections recently, both in wild and captive bird flocks.

Avian influenza virus infections which cause disease in humans are very rare but can cause serious disease and deaths.

We also publish technical briefings on the investigation into the risk to human health of avian influenza (influenza A H5N1) in England.

Published 29 November 2022
Last updated 25 July 2024 + show all updates

1. 25 July 2024

   Added 'Influenza A(H5N1) 2.3.4.4b B3.13: US cattle outbreak update'.

2. 29 May 2024

   Added assessment of A(H5N1) 2.3.4.4b: US cattle outbreak.

3. 3 May 2023

   Updated 'Ability to cause (a) severe infection and (b) asymptomatic infection in humans' section of Technical risk assessment for avian influenza (human health).

4. 2 February 2023

   Corrected date in 'Technical risk assessment as of 30 January 2023 for avian influenza (human health): influenza A H5N1 2.3.4.4b'.

5. 1 February 2023

   Added 'Risk assessment as of 30 January 2023 for avian influenza (human health): influenza A H5N1 2.3.4.4b'.

6. 29 November 2022

   First published.