We had a bird flu epidemic in S.A. a few years ago... In the big ostrich farming region. 1,000's of ostriches had to be put down, people had to get rid of their chickens, you were not allowed to keep ostriches/chickens with any other livestock on the same farm (???)... Lots of farmers suffered serious losses with little to no compensation and many farm workers lost their jobs. It was a nightmare! The closest case of bird flu was about 20 miles from where I lived, but we were o.k. thankfully... I spoke to the state vet one day and he said to me "Some days I HATE my job!"

He had to go test all the birds and put down every single bird on the farm if ONE tested positive. He told me how farmers used to hide their ostriches and move them around after dark...
I had the state breathing down my neck about my chickens, which I refused to get rid off, at first. Ended up having them round to take blood from a bunch of my birds to get tested. One of them told me they are going to cull all my chickens, regardless of whether they are sick or not and I said well, you can start with ME then, because I will stand between you and them if you come here! After that we came to an agreement, I'll look after my flock, as I always did, and let them know of any losses, and they'll leave me in peace. And they did.