Subject: Red sex-link hen about 1 year old. Symptoms: A few weeks of steady feather loss, followed by increasingly listless behavior. Now at 4 weeks or so into the illness she's frail has good days and bad but even at her best she looks pretty bad. Eyes slightly bubbly at corners--often shut. Still has appetite and drinking, but has segregated herself from the flock. Feather loss has stopped. Comments: At first I thought it was a molt. feathers were dropped at an increasing rate. She was fine otherwise. Slowly she became hermetic, more listless and generally crappy. Egg production has ceased. Her poop looks fine, though. And she does eat and drink--occasionally with gusto. Funny thing is there are days where she looks like she's gonna drop dead any second, then the next day or so she looks like she's on the mend. None of my other birds seem to be affected. Any thoughts?