I have four chicks 8-9 weeks old.(2 Coronation Sussex, 1 Black Isbar, 1 Blue Maran) I have treated them with Corid in the past when I saw red poop. We recently moved them outside to their new big run and coop. Yesterday I noticed red poop when cleaning their house bedding. It looks like its from just one chick. It has been pretty wet and HOT here (south Louisiana), but their run has a mound of sand that provides a "dry area" and their coop is completely dry and clean. Could it be that one of the chicks didn't contract Cocci last time so the Corid didn't work for it? I thought once they contracted it and were treated, they could not get that strain again. Maybe it is a different strain? Thanks for any comments.