I was wondering is it possible for a chicken to get exposed to a disease and never become ill? Im just a little confused. Lets say you have a few sick chickens and there are perfectly healthy ones in with them. The healthy ones never show any signs of becoming ill are they still considered carriers even though they have never been ill. I posted back a few months ago about some sick chickens that I rescued. Im not positive what was wrong with them some died and others remained healthy. I have 7 that lived out of the bunch. These have been completely symptom free. They only respiratory symptom that the unhealthy ones showed were a few had some minor sneezing, afew had some eye swelling and fluffing(right before they died) with closed eyes. The remaining birds were always perky. All of them even the sick birds had very good apetites and drank well. So since Im not sure what ailment they had they remain separated from the others in flock. Im just wondering could this have been something like cocci and the respiratory was a secondary infection that killed them? Is it possible that these other birds are okay and non carriers??????