Updated joint FAO/WHO/WOAH assessment of recent influenza A(H5N1) virus events in animals and people

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dc.creatorFAO; WHO; WOAH;
dc.date2024-08-14T13:36:09Z
dc.date2024-08-14T13:36:09Z
dc.date2024
dc.date2024-08-14T13:30:26Z
dc.date.accessioned2026-06-28T01:08:59Z
dc.descriptionDuring 2020, high pathogenicity avian influenza (HPAI) A(H5N1) clade 2.3.4.4b viruses arose from previously circulating influenza A(H5Nx) viruses and spread predominantly via migratory birds to many parts of Africa, Asia and Europe. This epizootic event has led to unprecedented numbers of deaths in wild birds and caused outbreaks in poultry. In late 2021, these viruses crossed the Atlantic Ocean to North America and subsequently reached South America in October 2022. Over the past few years, there have been increased detections of A(H5N1) viruses in non-avian species globally including wild and domestic (companion and farmed) terrestrial and marine mammals, with recent cases in livestock in the United States of America. The majority of A(H5N1) viruses characterized genetically since 2020 belong to the haemagglutinin (HA) H5 clade 2.3.4.4b, with some regional exceptions. Since the beginning of 2021, 35 detections of A(H5N1) virus in humans have been reported to WHO, along with five cases of A(H5) virus detection in persons exposed to A(H5N1) infected animals. Of these human cases where the A(H5) clade is known (n = 31), 17 have been caused by clade 2.3.4.4b viruses.
dc.format12 p.
dc.formatapplication/pdf
dc.identifierhttps://openknowledge.fao.org/handle/20.500.14283/cd1970en
dc.identifier.urihttp://hdl.handle.net/123456789/328740
dc.languageEnglish
dc.publisherFAO ; WHO ; World Organisation for Animal Health (WOAH) ;
dc.rightsShared
dc.rightsCC BY NC SA 3.0 IGO
dc.titleUpdated joint FAO/WHO/WOAH assessment of recent influenza A(H5N1) virus events in animals and people
dc.title14 August 2024
dc.typePolicy brief

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