chickens do not have colds. they can have clear drainage from dust, feed, or MS. They can have snoot so to speak with crd or other resp. disease. Also the chicken flu can cause the rapid decline of chicks that are sneezing. It is better if they are dying to get them checked. That way you know what to treat and what to get rid of . I had to kill a whole flock this winter because of a bad strain of ms. Then the cleanning and decomtaminating started. I am even remodeling while I am at it. Please call you Agr. extension agent and he can tell you who to get or where to take a bird for testing. Good luck with this. Gloria Jean