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From what I understand is that once cocci is thoroughly treated it is out of the system completely. It is a parasite, so if it is dead, it is dead. Kinda like roundworms, but nastier as far as symptoms go. Cocci is part of the Cryptosporidium family, which all animals (including people) are susceptible to getting. However, I have always hear that it is treatable if caught early enough. Bloody stools is a common symptoms, but not always. I had a chick with coccidiosis who did not have blood in her stool, but has the tucked up look, sleeping all the time, fluffed up with drooping wings. Other in the flock can get it from pecking where droppings (wild bird or chickens) are that are infected with cocci.
I agree with Glenda, that it is worth a shot in trying to treat for cocci. It can't hurt to give it a shot. However, I wouldstill recommend posting all other symptoms to see if they ring a bell with anyone.
I haven't read any replies to this, but Cocci is never completely eradicated from an area. Cocci will remain in the vicinity through the poultry gut. It is when the levels of cocci (poopy environment, bad housing, wet surroundings, etc.) that the cocci imbalance in the environment happens. When that happens, the cocci in the gut increases and the imbalance in the gut of the bird effects the nutrition in the feed. The cocci absorb the nutrients rather than the bird.