In 2019, an outbreak of avian influenza (H3N1) virus infection occurred among commercial poultry in Belgium. Full-genome phylogenetic analysis indicated a wild bird origin rather than recent circulation among poultry. Although classified as a nonnotifiable avian influenza virus, it was associated with reproductive tropism and substantial mortality in the field.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7392414PMC
http://dx.doi.org/10.3201/eid2608.191338DOI Listing

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