Research and analysis

Influenza A (H3, H7, H9, H10): incubation and infectious period

This rapid systematic review identified and summarised evidence of the incubation and infectious period of influenza A (H3N8, H7N9, H9N2, H10N3 and H10N5).

• From: UK Health Security Agency
• Published: 9 December 2025

Documents

Incubation and infectious period of zoonotic influenza A: a rapid systematic review

Ref: Published: December 2025

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Details

This rapid systematic review identified and summarised evidence on the incubation and infectious period of zoonotic influenza A H7N9, H9N2, H10N3, H10N5, H3N8 (search 1 January 2013 to 17 March 2025).

Eleven retrospective cohort studies and 2 case reports were identified for inclusion.

Published 9 December 2025