I have a 20 week old Cockerel with a breathing problem. He wheezes was he takes a breath. In every other way he looks and acts fine. I took him inside in a cage to separate him from the rest, even if it's too late. I gave all the flocks oxytetrocycline in the water. I gave him some in his water and on an apple chunk I just put in. No other bird has any problem. I held him and my wife looked in his throat but saw nothing. No chicken vets around here in Western MA that I know of.