I just brought a couple new hens home on Thursday afternoon = bought from the same person. They looked healthy so I made the mistake of putting them right in with my other hen. Major mistake!!! The next day one of the new hens was making a coughing sound and wet by her nostrils. I took her out to a hospital pen, but the damage was already done as when I checked the other new hen and my original one this morning, my original hen was standing making a "wheezing" sort of sound when she breaths out. : ( Antibiotic started this morning. Is there a respiratory disease thought that has a very short incubation period of just 2-3 days?