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 last duck farm on New York's Long Island is facing an uncertain future after a bird flu outbreak forced the culling of nearly 100,000 ducks. The highly contagious H5N1 avian flu, otherwise known as bird flu,

As more cases of bird flu emerge across the country, public health leaders in New York City are watching warily -- and making preparations in case the virus becomes a more immediate threat.