I live in ks. This past summer my chickens started wheezing,cough, noses ran. I bout the vet RX from loCal feed store. Treated them all with it. Mad a spray with it & treated each daily orally & spray mist every eve as the roosted. That was in June. Did not lose any, but some still cough & wheeze! I got SMZ-Med 454 and have been Givin it to them in their water, but still some yuk going on. The vet said it could take up to 3 wks for them to get over it but if not there's another. Picking it up tomorrow! Any other suggestions are very welcome! Then, to make matters worse, I went out this morn to gather eggs, found a hen sitting behind a post & almost appeared dead. Picked her up to check her out. She's not dead. No wheezing or coughing but lethargic & after examining her again, I found 1 black dot on her comb. Could this be the start over Avian pox? If so, what should I do?