China had to kill gobs of birds a few years ago...it's insane. I blame antibiotics. If you haven't read Big Chicken by Maryn McKenna..it will scare you.
Oh dear..this is frightful. I don't live in your state. But I've read about avian flue. Scary stuff. Is there anyway you can burn some ground? And reseed. Usually tremendous heat kills pathogens..I know spit balling...I'm sorry for your situation..