I had salmonella or paratyphoid two years ago was told to kill all birds an burn your shed to the ground .didnt listen treated with ernoflux lost a couple of birds an also my best distance hen which can't get of the ground due to wing drop she bred me a winner this year out of 3 eggs so not all doom .a did find that one particular cock a bought of the Internet every yb died in the nest whether he rared it or not he was put away so touch wood not had any problems for two years good luck .