Hi, I have read that birds with respitory desease can be carriers for life. My question is do they transmit itto other birds even when they are treated and have no signs? Also, is there diseases contagious even when it has been treated and is is in remission? I have always been under impresssion that some Viruses live in their host body for life and never bacteria after being killed. At the same time I have read that some bacteria infections in chickens that cause respistory diesease stay with them for the rest of their lives and it just goes into remission. How bacteria after using Antibiotic will still stay in the host's system? Antibiotic should kill them all. Am I right?