It likely came from migrating birds which are believed responsible for outbreaks from the Florida to Maryland and in Nova Scotia and Newfoundland.
It is the first case of the disease in a commercial flock in the United States since 2020.
Then avian influenza ravaged the U.S. poultry industry, in some cases wiping out flocks of hundreds of thousands of laying hens.
In Ontario, the poultry marketing boards and industry have established a command centre and have been able to nip outbreaks in the bud.
