One thing I have asked before and very little comment is; What does the fancier do with any dead infected bird, if they just put it in the bin then it ends up in landfill where scavengers roam and feed on infected birds. A bird or rodent could then pass on the infection and thus spreading the disease further. :-/
I am lucky that I stay across from the paper mill and my mate is the manager and would let me dispose of any in the furnace, other than that what could or do you do with them
Another thing is what happens to the infected droppings :-/