About seven months back and half of them died of coccidiosis despite being treated. About three months later I got silver laced wyandottes and half of them died of coccidiosis too. They were put in the same coop but I cleaned the coop and burned the shavings, now I am hatching marans and sizzles and don't want them to be infected. If anyone knows how to keep them from being infected it would be appreciated I have had chickens for a few years but am not familiar with chicken diseases.