Yesterday at a show I bought a black Cochin pullet, but she keeps coughing/sneezing. The sneezes aren't like the sneezes of my other chickens. They sound like little dog growls. I'm pretty sure it's mycoplasma infection. Yesterday in the car she started foaming at the mouth a bit. She is under quarantine. Other than the coughing/sneezing she is fine. Her eyes are bright, she can walk, her poops are normal. She was raised with turkeys. Does anybody know how to treat mycoplasma infection? I've heard of Tylan, but I don't know how much to use. The Cochin is 6 months old, female.