I know you all have probably heard these questions a million-billion times over, but I did some digging around the site and found nothing as informative as I would've liked. (To be fair, I'm probably not looking for the right things. This is the first time I've ever seen this before.) My chicks are halfway between four and five weeks old. Last Friday, they had their first official day out, but it was stormy/rainy and so they were in the shelter of the garage with the door open part of the way. I understand coccidiosis comes from the earth or the air, and there's no doubt that dirt had been tracked into the garage over the years, so I think it's safe to say that's when they were really first exposed. Yesterday, they had their first day in grass. Within three hours of them going out yesterday, I started seeing partially bloody stools, but I didn't see fully bloody stools until this morning. I went ahead and mixed a little apple cider vinegar in their water this morning after seeing that. The chicks show absolutely NO signs of any illness. In fact, if I hadn't seen the bloody droppings, I'd never have known they are sick. They still run around, fly everywhere, scratch, peck, eat, drink, everything! The only other symptom I'd say they have is that they seem to be drinking just a little bit more than usual. First of all, is this actually coccidiosis? Does it usually come on that fast, or would there have to have been and earlier exposure (because I don't think they were exposed any earlier than Friday)? Second of all, I hear the best treatments (amprol, corid, sulmet) aren't actually sold for chickens. What would the dosage be for 13 4-to-5-week-old chicks? And which of these treatments can be found at a Tractor Supply Co. (since that's about the only place around here I can go to for this stuff)? Third of all, I have never seen ANY coccidiosis in the 7 or so years I've been around chickens and NONE of my girls have been raised on medicated chick starter (save for maybe the 7 hens we've gotten at point-of-lay; I don't know for sure on those ladies). Should I switch these chicks over to medicated starter to be safe or would that just be too little too late? Thanks in advance for any answers and sorry if you're tired of seeing this!