Hello all! I have 4 week old chicks, and two days ago I noticed some unusual poop. It has the look and consistency of raspberry jelly. I isolated each chick for a short period of time to find out which one was the culprit. Her feathers have been ruffled, and she feels lighter than usual, is not eating/drinking much. I know this is textbook coccidiosis. I have a few concerns regarding this though: 1. They were all vaccinated for coccidiosis at Murray/McMurray hatchery, so I have been using UNmedicated feed (which is par for the course when they are vaccinated). Can they still get cocci despite vaccination? 2. Two days before the bloody stool began, I switched them to a different brand of feed, but they all ate it just fine 3. None of the other chicks are displaying symptoms-- and I moved all of the healthy ones outside to their new coop yesterday. The sick chick is currently in isolation in the brooder 4. Since yesterday the sick chick has had no further bloody stools, but still appears ill. Should I start treating them with Corid even though they have been vaccinated? Should I switch back to the old feed? Is there anything else I can be doing for the sick chick? (I have isolated her, given her yogurt, and a mush of milk and feed) Thank you so much for your help! I am a nervous first-time chicken mama!