I've lost one chick to what I'm presuming is cocci. The rest are all currently fine, but since they are all living in the same coop, same run, etc I'm going to go ahead and treat with Corid for 5 days. My question is this: Should I go ahead and treat my older flock as well? If cocci is in my soil, then they are surely exposed too. In all my reading about cocci, it always talks about it being a condition from crowded or unsanitary conditions. I can honestly say my chickens live in the cleanest chicken environments I have seen. I am out there 2-3 times/d scooping poop, and they live in spacious quarters...so it must just be in my soil from wild birds. Any advice on whether or not I should treat my older girls (1 year old) would be appreciated.