8 months ago I had an 11 year rooster contract Marek. He died. The rest of the flock was uninfected. My vet said they probably got it from wild bird, since I don't breed and had not adopted new chickens. 3 weeks later I did adopt a new chicken and she contacted Marek also. Luckily with intensive treatment she fully recovered. When will it be safe to reintroduce new chickens? Or is this now for life?