I just culled one of my ex-battery white leghorns and started the flock on antibiotics. This one had a trimmed beak from its former life and was never as healthy as my other ones. Her eye was swollen and she was congested. After last time I am taking no chances. No new chickens in the flock, except for some perfectly healthy baby chicks that are in a different building. I scrub my hands between duties so that can't be it. Sigh.