Can take out a entire flock in 48 hours….
Check it out:

A flock of 200,000 hens in Wisconsin is the first commercial U.S. chicken operation to become infected with a lethal strain of bird flu, the U.S. Department of Agriculture said, widening the impact of a virus that has killed hundreds of thousands of turkeys this year.

Since the beginning of the year the flu, which can kill nearly an entire flock within 48 hours, has been found in commercial poultry operations and backyard poultry flocks in 11 states stretching from Oregon to Arkansas.