I also have adult chicken with an ailment especially roosters. The comb has turned bluish, started with difficulty in breathing and produced kind of a raspy sound while breathing (generator like sound), breathing with the mouth open, the sound is almost lost, eyes seem sunken, went to local agrovet,, was given biotrim vet to administer for seven consecutive days,, no change and later given arocycline and still no change, what could be the definitive diagnosis and its curative treatment?