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. 2023 Sep;29(9):1842-1845.
doi: 10.3201/eid2909.230067. Epub 2023 Jul 24.

Highly Pathogenic Avian Influenza A(H5N1) Clade 2.3.4.4b Virus in Wild Birds, Chile

Naomi Ariyama, Catalina Pardo-Roa, Gabriela Muñoz, Carolina Aguayo, Claudia Ávila, Christian Mathieu, Leonardo I Almonacid, Rafael A Medina, Barbara Brito, Magdalena Johow, Victor Neira

Highly Pathogenic Avian Influenza A(H5N1) Clade 2.3.4.4b Virus in Wild Birds, Chile

Naomi Ariyama et al. Emerg Infect Dis. 2023 Sep.

Abstract

In December 2022, highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus emerged in Chile. We detected H5N1 virus in 93 samples and obtained 9 whole-genome sequences of strains from wild birds. Phylogenetic analysis suggests multiple viral introductions into South America. Continued surveillance is needed to assess risks to humans and domestic poultry.

Keywords: Avian influenza virus; Chile; H5N1 subtype; influenza; influenza A virus; respiratory infections; viral dissemination; viruses; wild birds; zoonoses.

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Figures

Figure 1
Figure 1
Distribution of samples collected and tested for HPAIV H5N1 clade 2.3.4.4b virus in wild birds, Chile. A) Map of Chile shows regions positive and negative for HPAIV. B) Detail of area in which affected birds were sampled. Size and color of circles indicate sample size and percent positivity. HPAIV, highly pathogenic avian influenza virus.
Figure 2
Figure 2
Images of Peruvian pelicans (Pelecanus thagus) collected and sampled for highly pathogenic avian influenza virus H5N1 clade 2.3.4.4b, Chile. A) Dead pelican found on land near shoreline; B) ill pelican in water near shoreline.
See this image and copyright information in PMC

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