I have 8 hens and a roo. The roo and about half of the hens are sneezing or coughing. No change in behavior and there combs are bright red so I treated them with 1/2 cc Tylan injected and will continue for 3days. The question I have is, should I treat the other 11 pullets I have in the same coop seperated by chicken wire? The pullets are not showing any symptoms.