Skip directly to site content Skip directly to page options Skip directly to A-Z link Skip directly to A-Z link Skip directly to A-Z link

Volume 32, Number 10—October 2026

Dispatch

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

Jansen de AraujoComments to Author , 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, and Edison L. Durigon
Author affiliation: University of São Paulo, São Paulo, Brazil (J. de Araujo, L.M. Thomazelli, G.O. Fenner, E.G. Dorlass, A.K.A. Eisen, M.G.L. Barboza, E.E. de Souza, C. Wrenger, E.L. Durigon); St. Jude Children’s Research Hospital, Memphis, Tennessee, USA (T.P. Fabrizio, R.J. Webby); Hospital Israelita Albert Einstein, São Paulo (E.G. Dorlass); Instituto Butantan, São Paulo (V.F. Botosso); Centro de Manejo e Conservação de Animais Silvestres, São Paulo (M.S. Nardi, C.C. Aires, S.M.N. Teixeira, R.M. de Azevedo, M.H. Frediani); Centro Nacional de Pesquisa em Energia e Materiais, Campinas, Brazil (T. Ometto); Institut Pasteur de São Paulo, São Paulo (C. Wrenger, E.L. Durigon).

Main Article

Figure 1

Location of Ibirapuera Central Park where waterfowl were found dead from divergent highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus, São Paulo, Brazil, 2025. Map shows location in South America. Satellite image of park shows red outline of Ibirapuera Central Park, São Paulo, Brazil; red dots indicate the location where the 2 birds were found dead. Satellite image is from the catalog of images of the National Institute for Space Research (https://www.dgi.inpe.br/catalogo).

Figure 1. Location of Ibirapuera Central Park where waterfowl were found dead from divergent highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus, São Paulo, Brazil, 2025. Map shows location in South America. Satellite image of park shows red outline of Ibirapuera Central Park, São Paulo, Brazil; red dots indicate the location where the 2 birds were found dead. Satellite image is from the catalog of images of the National Institute for Space Research (https://www.dgi.inpe.br/catalogo).

Main Article

Page created: July 16, 2026
Page updated: September 28, 2026
Page reviewed: September 28, 2026
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
file_external