Not that well...it's pretty gutting to have to do the deed on sick birds. Even though I process my own meat birds, I always feel sad dispatching sick hens. On the plus side, this should finally allow us to turn the page on our broken start : we started with DC heritage poultry in shawville (https://www.backyardchickens.com/newsearch?search=DC+heritage&type=36) and always had the feeling the birds we got weren't healthy. If the mg theory holds, they probably carried it since the start.
Most sad that there will be pressures to destroy our geese and ducks as well. Are there ways to test birds for MG? That way we could keep our geese at least.
They can do blood tests for it, However, I am not sure if you or the state would have to pay for it. I think here they would make you pay for it. Even then they could order the whole flock destroyed (I Think) in an over abundance of caution.
I am fairly certain every bird on the property would have to be destroyed here.