I have done everything possible to get rid of this crap. I've used corrid, I've disinfected coop, I've even taken some to the vet. The only information you find on the Internet is treating young chicks. My problem is from pulley to laying hen age. It's been a miserable year with coccidiosis. Trust me when I saw I keep everything clean. I treated them with corrid, and they still get it. What else is there left to do? I am almost thinking it is an environmental thing that is no fixing.