Don't freak out. All chickens have some level of Cocci. It's in the poop, the soil of your yard, garden, chicken run, etc. Baby chicks have it (your day olds on up). It's when there is an overload/overgrowth that it becomes a problem.
Medicated feed in the U.S. contains a "preventative"...
Hi @yeye5
Can you post some photos of the poop?
Wazine-17 is a de-wormer (for roundworms only), it will not treat Coccidiosis. Symptoms of Cocci include lethargy, going off feed, diarrhea with mucous or blood and the birds have a fluffed up/disheveled appearance.
Corid (Amprolium) is a...
Sorry to hear about your losses. As @Eggcessive mentions, they should have the Corid water at all times.
Some other things to look at is space and heat. Do you have any photos of where they are being kept?