I was an idiot and bought 2 hens yesterday. They looked healthy, no nasal discharge-eyes clear. Tonight---one has clear nasal discharge/rattly breathing and smells like well...roadkill. Is the the beginning of coryza? They have already contacted the other flock via me walking more than likely. I'd rather not cull the flock if I don't have to. I have also never culled before. I will if I have to, please help and tell me what to do. Antibiotics/vaccines/cleaning etc. Other than the nasal discharge/rattle she looks normal, no swelling.