My hen that I think had it is fine now. I had been giving her homemade feed and she was living in the house: bad combination. I had a bunch of chicks at the time, so I gave her some of their chick starter and made sure she spent as much time as possible outside in the sun. She recovered quickly, and now we've moved and she spends all day outside with her friends like a normal chicken. Doesn't lay much anymore, but she's 4 years old, and not a super-laying breed.