I have been raising chickens for five years and have never had two hens die within a day of each other. The one was very lethargic and her comb was purplish in color. At the time of her death, she had some mucus coming out of her mouth. The other hen was eating and drinking but had a shrunken comb. I have never had any major diseases in my coop. Any suggestions? I have 41 gals left.