New York’s Long Island was once synonymous with “duck” in the culinary world. Now it may lose its last commercial farm. The avian flu outbreak that has led to the slaughter of millions of birds at U.S.

The highly infectious H5N1 strain has caused outbreaks across the country. Now, Long Island’s last duck farm must kill its entire flock and may go out of business, its owner said.

The Crescent Duck Farm in Aquebogue, which lost its entire flock of 99,000 to an outbreak of bird flu, has begun the long, methodical process of sanitizing its facilities.