I have has 5 chickens die in the last 48 hrs. In the week prior there was some indication of respiratory illness with some sneezing and rattling breathing. There have been some temperature fluctuations so I made sure ventilation and temperature were watched. However, the day before the first death I noticed some listlessness and droopiness in some of the hens. Now some of the hens have puffy eyes and bloody mucus discharge from their nostrils along with the labored breathing. I had a beautiful flock this Autumn but now I am worried about losing all 75. What should my mode of action be? Necropsy at the vet? Antibiotic? Depopulate? Other options? I'm very worried for the lives of these beautiful animals. I'm worried that I haven't properly conducted the deep bedding method and the humidity has allowed disease to set in. Some one please help.