The state of Fl Dept of Ag & Animal, they just said pnuemonia but these were 6-8 month olds, young but not little. I thought Mareks because they started with a limp, but none was found in any of the birds then or before, and that was a suspicion. They also had a secondary cocci, but I have been dosing all my flock with Amprolium 3cc per gallon of water, 7 days. Used sulmet too before. I am at a loss.