Multiple independent introductions of highly pathogenic avian influenza H5 viruses during the 2020-2021 epizootic in France.

Authors :: Briand FX
Niqueux E
Schmitz A
Martenot C
Cherbonnel M
Massin P
Busson R
Guillemoto C
Pierre I
Louboutin K
Souchaud F
Allée C
Quenault H
Lucas P
de Wiele AV
Blanchard Y
Eterradossi N
Scoizec A
Bouquin-Leneveu SL
Rautureau S
Lambert Y
Grasland B
Source :: Transboundary and emerging diseases [Transbound Emerg Dis] 2022 Nov; Vol. 69 (6), pp. 4028-4033. Date of Electronic Publication: 2022 Oct 05.
Publication Year :: 2022
Abstract: During winter 2020-2021, France and other European countries were severely affected by highly pathogenic avian influenza H5 viruses of the Gs/GD/96 lineage, clade 2.3.4.4b. In total, 519 cases occurred, mainly in domestic waterfowl farms in Southwestern France. Analysis of viral genomic sequences indicated that 3 subtypes of HPAI H5 viruses were detected (H5N1, H5N3, H5N8), but most French viruses belonged to the H5N8 subtype genotype A, as Europe. Phylogenetic analyses of HPAI H5N8 viruses revealed that the French sequences were distributed in 9 genogroups, suggesting 9 independent introductions of H5N8 from wild birds, in addition to the 2 introductions of H5N1 and H5N3.<br /> (© 2022 The Authors. Transboundary and Emerging Diseases published by Wiley-VCH GmbH.)

Subjects :: Animals
Phylogeny
Animals, Wild
France epidemiology
Influenza in Birds epidemiology
Influenza A Virus, H5N1 Subtype genetics
Influenza A virus genetics
Poultry Diseases epidemiology

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