I traded a goat for some chickens. The chickens have what sounds to be a cough or sneeze....they eat & drink and are free ranging hens. Will they infect my other chickens? They all are locked up in the same coop at night. I have had them all together for the whole summer. Only one of them seems to be sluggish. If we should have to end their lives,,,,,would they be ok to eat? Sorry chicken pet owners...we have some that are pets also? Just asking.