Mahonri, they were from the last 3 hatches. All were in the swingset together. So, from about 3 weeks to about 2 1/2 months old. They got to where they couldn't stand, walk, legs straight out, labored breathing. All totaled I probably lost 10 chicks. Some pretty suddenly. The ones that made it to sick bay got a shot of Tylosin and then after NoSkiveez told me, they got dusted with DE. After the dusting is when the improvement started. It took about 1 day and they were able to get up and around, and now look normal. I'm keeping them segregated for another week to dust them again. I put Sevin and DE down when I moved all the juvies to their new temporary housing unit.