It all started a few weeks ago when a fox got into my coop and killed 9 of my hens. That left me with 4. I then purchased some laying hens from a local woman only to discover when I got them home that they had favus, one has a respiratory infection, lice, scaly leg mites, worms, and a pullet came down with coccidiosis. They have all had Wazine, been dusted for lice twice now, and the pullet was successfully treated with Corid. I got rid of the ones with favus and the one with the respiratory infection the same day I brought them home (gave them to someone who had the ability to quarantine etc. I have NEVER in my 3 short years of being owned by chickens, had more than a bit of a cough in some young chicks. Now ALL of them are coughing, snotty, wheezy..they sound just like the one with the respiratory infection. Could it be that I didn't catch these ones starting to come down with it and now it's full blown? Or could the incubation period have been around 21 days for this? I'm so sick of treating these girls, and tossing eggs I don't even enjoy them anymore. I now have them all on Oxytetracycline at a dosage of 2.5tbsp per gallon of water (found the dosage here). They've been on it for 3 days and they aren't sounding better yet. When should they start to sound better? Everyone is active, and eating and drinking well. Also, what's the best way to get rid of the scaly leg mites? I have NO idea how this insane, crook of a woman passed her NPIP certification, she's blasting it all over facebook. My guess is that she only had them test one of her flocks (she said she had one at her home, and one at another property). Needless to say, I'm blatantly telling everyone to steer clear of her.