I am now totally confused and concerned that I may not be doing the right thing for my new babies. I won't bore everyone with details, I have tried and gotten nowhere. Essentially my problem is with the fact that baby chicks need to build an immunity to coccidiosis. Some of my chicks have it. One was vaccinated against it, so she has it too (right?). I am giving Sulmet because I can't stand for them to suffer, or to lose any, so the vaccinated one now presumably has no immunity (right?). I am treating them all so, presumably, none of them are building immunity.... At what stage do you decide to let them go through it on their own? I don't understand. The information is so conflicting. Can anyone help and tell me what to do? One looks very sick, the others look fine. But what am I doing to the natural cycle here? Can they build an immunity to cocci if we treat the disease at the first signs? Why bother to vaccinate against it when it seems that most chicks are at risk of getting it, even when they have had no contact with the soil, as is the case with mine, and they need to get it in order to build immunity? This no longer makes any sense to me. Can anyone help? I am really having a hard time here. Please.