This was all really helpful! My first hen to get it is now completely recovered, the second of my four hens now has some small lesions on her comb, but now I know not to panic. I wonder if the birds shown on that site, with such advanced cases, were more stressed or less well-fed than the average "pet" chicken? Maybe our spoiled babies are better able to cope . . . yeah, I'll go with that. It's a good reason to keep spoiling them!