If you look up Fowl Pox On the BackYardChicken.com there's a great article including photos. However, what's missing is whether a chicken that has gone through the pox is immune to future outbreaks? The article says the birds who have gone through the pox and recuperated are NOT carriers, but I want to know if my chickens can get Fowl Pox again? Or, do I need to get them immunized? Thank you!