Kathy,,last year one evening my lite bulb went out on the brooder box (for 5-6 hours before I came home) that sat on my dining room table.Had about 15 peachicks in that group and after 2-3 days I noticed white poo and a strange smell.I then found the guilty peachicks and scrubbed their rear ends good and dried them off,but in the poo you can feel grit or a sandy texture and once you smell it,you will remember it. Anyway if you cannot keep the vent clear the peachick cannot poop.I made some calls to get the right medicine but it was the weekend and it was like 4 days before I got the corrid.The chicks all seemed to be doing better but then everyone that had white poo died.I seperated them from the others to prevent the spread but I'm 99.999% positive stress from the lite bulb burning out caused them to stress so much it brought on coccidosis,,it's the only time it has happened here amd I feed 22% gamebird medicated feed so that alone will not stop this disease.