Chickens can get a bit of a cold sometimes. The last time I had this I put some amoxicillin in the water. You can get powdered amoxicilin from a pigeon or chicken supply house online. I think I got mine from either Global pigeon supply or Foy's. Works great. It's also a good idea to have a few meds on hand ahead of time. Good things to have would be sulmet, corid, amox, wazine, poultry dust etc. If you happen to have any in your house break a half a pill and shve it down there throat for a cpl days. you your fingers to work it down into their crop to make sure they don't spit it out. Good luck.