Recently we had a chicken come down with some sort of respiratory infection and die. https://www.backyardchickens.com/t/1127966/13-week-old-chicken-labored-breathing We gave all of our birds antibiotics as recommended by a member on this forum but we have a problem. We have recently read that if chickens are exposed to a respiratory illness they are carriers for life. Is this true? Because that would mean all our birds have it permanently. We were going to sell some roosters but do we dare sell them now? Won't they get someone else's flock sick? Also, will it pass down if we raise chicks next spring? Can we eat the eggs once they start laying? We're very worried we are going to have cull them all and start over now.