I adopted a stray rooster a friend found in Los Angeles a few months ago, and I fear he may have mareks. I noticed he had a slight limp when I got him, And I think he was about 4 months old (he's since gotten bigger and slowly started crowing). A few weeks after I got him, two of my hens had some sort of cold, and one was very ill but survived. Since then, she became broody and hatched 10 chicks. I gave five away and I'm keeping five. Anyway, the roosters lamp has gotten worse lately. over the course of a week he Started spending all of this time just laying down in the coop. He can't seem to use the one foot at all and just limps to get to his food and water , using his wings to get around. Theres no visible injury to the foot, he kind of balls it up but doesnt seem hurt if i move it around. His condition hasn't seemed to change it in the past two weeks he just stays in the coop, and he's still eating and drinking. I don't know if he's Getting any worse, he doesn't seem to be. I don't know whether I should keep him going like this or just put him down. But an even bigger question is, what is the threat to the 5 chicks that are just over a month old? Should I vaccinate now? Any help at all would be appreciated!