Something's making its way through my two flocks right now (chicks and adults). Here are the symptoms: 1. Lots of sneezing / gaping / gasping 2. Much congestion in the chest, rattling when they breathe 3. Unable to cluck or crow because of the congestion 4. In some of the smallest chicks, there's a little bit of lethargy, but I haven't lost any and none of the chickens act sick at all. 5. Whatever it is does seems to be contagious, and last about 4-5 days. I know that rules out hay fever, but my chickens are reminding me of myself in the springtime when the pollen starts blowing. I've been dealing with it for a couple of weeks, and there never seems to be more than about 10% of either flock that's sick. It's definitely jumping, though. I've been treating them with Terramycin in the water, and I did a worming treatment because initially I thought a swollen crop was a symptom and the poultry science specialist down at Auburn thought I might have worms. Later, I decided the crops were just full due to pigginess. Anyone encounter anything similar? I'm mostly curious as to what it might be. Like I said, it doesn't seem to make anyone feel particularly sick, but they sound awful while they've got it.