I have some 2 y.o. chickens and some 7 month olds. They roost on opposite sides of my coop. This morning I found a blob of very bloody poo under the youngsters' roost. I was under the impression that Cocci is not a problem for birds over 4 months old, but I am thinking this is what it is. I would like advice on how to procede. I have some Sulmet. Could I give the entire flock that? Should I isolate only my young ones? I would have to wait days to get my hands on any Corrid. Help me, please, friends!