Domestic birds that live in and around barns have been confirmed as the avian hosts of an outbreak on dairy farms in the United States of highly pathogenic avian influenza.

An April 16 update from the USDA’s Animal and Plant Health Inspection Service confirmed the avian host in this outbreak wasn’t migratory birds, as has been common with confirmed North American outbreaks on domestic poultry farms, but rather pigeons, grackles and blackbirds.

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