Hi, My 4 week old chicks were vaccinated for Cocci when I got them from McMurray, and I had them on unmedicated starter and everybody was doing great. Over the past few days, I've noticed some loose stools and some blood in the stool. I looked for Corrid but it was pretty expensive at Tractor Supply ($25), so I just switched them to medicated starter. Everybody is still eating and acting fine, but do you think I need to do something else? How long will the medicated feed take to work? If I need to buy the medication, I will, but I didn't want to spend the money if I didn't have to. Let me know what you all think. In the meantime, I'm cleaning the brooder like crazy. Never had problems with cocci before and thought the vaccine would be extra insurance, but now I don't know. Thanks.