My three hens apparently have the avian pox. They are five and six years old, no longer lay, but other than the scabby lesions, seem normal. My questions are the following: 1. I have no other chickens to contaminate. I heard the virus can be passed to other birds in bedding through scabs. If this is true, is it okay to let them out into the yard, or will they somehow contaminate it for other furture chickens? 2. What do I need to do to "disinfect" the coop when the lesions are gone, to insure future birds don't get this?