Need advice on disinfecting a coop following a Myco outbreak

[NancyNurseCxMama]

I am so sorry....sounds like you are doing everything possible for your girls.
Terribly heartbreaking.

 

[Taylorbrood]

Yellow droppings can sometimes be from overwhelming E.coli infection. That can sometimes happen with air sacculitis, a secondary baterial infection that can be a complication of MG or other respiratory diseases. Hopefully, your necropsy report will inform you of the illness. Pecking can be common from other birds when one is sick or acting ill. The recommendations above of the several disinfecting agents are good. I doubt that you are seeing blackhead, which is more a disease of turkeys, but it could be possible.

Well, not much can be done other then to enjoy what time I have with my flock and pray some survive or they all survive, got a double whammie with MG and Mereks. S/O says no more chickens