Are you saying your chicks died from cocci after receiving the cocci vaccine or another vaccine?
Yes. They received the cocci vaccine at McMurray, which the state vet was alarmed by - she didn't think any of the hatcheries were using it for home flocks. They were kept indoors at all times and the brooder, which the previous hens had been in, was cleaned with Tektrol twice before I got the chicks. Previous hens were from my mom's backyard, never vaccinated, and never had a cocci outbreak.