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.

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.

A New York region once synonymous in the culinary world for duck may lose its last commercial farm. Crescent Duck Farm on Long Island’s North Fork was struck by an outbreak of bird flu, prompting health officials to order the destruction of its entire flock this week.