I think I have megabacteria in my flock. Chicken are fine, eating and all but they don't put on any wheight, they can't lay a whole batch of eggs just one egg every fifteen days or so, when they ever get to lay one..Then one day it becomes more severe and they die. I've read the internet over, tried antibiotics, wormers, vitamins, and medicines against fungi. We can't get anfotericin B where I live. I've been using nistatin...unsuccesfully so far. Has anyone ever had this problem?