Ok, thanks for the info. I thought about putting the Lil' sucker out of its misery but just thought I'd give her some time. I really don't know what to do with her.Most likely one of the many chronic respiratory diseases chickens get. Birds are carriers once they get over them. It'll most likely pass all through your flock at this point. When they get stressed or sick from something else they'll break out again with the respiratory signs. You can give Tylan 50 injections, 1/2 cc for about 5 day in their left breast muscle. But keep in mind it'll be a constant battle.