Detection of Divergent Highly Pathogenic Avian Influenza A(H5N1) Clade 2.3.4.4b Virus, São Paulo, Brazil, 2025.

Authors

Jansen de Araujo, Luciano M Thomazelli, Thomas P Fabrizio, Gustavo O Fenner, Erick G Dorlass, Ana K A Eisen, Viviane F Botosso, Marcello S Nardi, Caroline C Aires, Sergio M N Teixeira, Roberta M de Azevedo, Mayra H Frediani, Tatiana Ometto, Mário G L Barboza, Edmarcia E de Souza, Carsten Wrenger, Richard J Webby, Edison L Durigon

Published in

Emerging infectious diseases. Volume 32. Issue 10. Pages 1707-1711.

Abstract

In 2025, we detected highly pathogenic avian influenza H5N1 virus in dead waterfowl at Ibirapuera Park, São Paulo, Brazil. Genomic characterization indicated a reassortant virus that emerged from locally circulating low pathogenicity avian influenza viruses and highly pathogenic North American lineages. Our results highlight cross-species transmission risk and underscore the need for enhanced surveillance.

PMID:
42811438
Bibliographic data and abstract were imported from PubMed on 30 Sep 2026.

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