There was another thread here on BYC that said apple cider vinegar prevents coccidiosis, you put it in the water.
This won't help this batch, but McMurray offers vaccination of the chicks for both Marek's and coccidiosis, 10 per chick, per vaccination. It may be worth it for you to have them vaccinated next time. I don't know if other hatcheries offer this, or if the vaccine is available to purchase for home use.
This won't help this batch, but McMurray offers vaccination of the chicks for both Marek's and coccidiosis, 10 per chick, per vaccination. It may be worth it for you to have them vaccinated next time. I don't know if other hatcheries offer this, or if the vaccine is available to purchase for home use.