I will just be so sad if I can't add any new chickens to my flock, we had planned on expanding next year after the chicks we got this fall are older. Possibly even hatching our own. I really wish I knew a good vet around here that I could have do some testing to find out what this is and how serious it is, but I feel like it will cost me an arm and a leg! I need to make some phone calls to the feed stores and see if they know of anyone. But money is a bit of an issue right now, we aren't broke but I also don't have any extra laying around to drop a bunch at the vet. I sure wish it grew on trees, or that maybe it could be laid by chickens! Well, I guess it sort of is when you sell your eggs haha. We have just now started getting enough to sell, so they aren't exactly paying for themselves yet!!If its viral, then I would imagine that your whole flock has the problem, just that either possibly their immune systems can cope better than others. I guess its a bit like humans getting the flu or a cold - some suffer more than others. Each flock member may show symptoms at one time or another. I have this issue in my flock and they usually get over it after a week or so. I must stress however that i am by no means suggesting that problem IS viral.
All the best
CT