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Coccidiosis is a dangerous disease in chickens. Mortality rate in chickens affected by this disease is around 50-80 per cent but may reach 100 per cent if not treated properly. That is, for chickens, coccidiosis is an important disease from the economic point of view, which has almost the same effect in the whole world. The importance of coccidiosis can also be assumed by the fact that after arrival of this disease in the poultry farm, the entire farm become empty. That is, it is difficult to save the chickens from death and the farmers have to face heavy financial losses. The disease is caused by various species of eimeria (protozoa) in chickens. Chickens raised on husk or on the ground are more affected by this disease. Apathy towards feed in chickens suffering from this disease, dehydration bloody diarrhea, watery diarrhea in some birds, dullness in one place, weakness and becoming sensitive to other diseases are seen (Figure 1). In this disease, the intestine of the chickens suffer the most, due to which all other symptoms of the disease are seen. Therefore, this disease can be divided into two parts depending on the affected parts of the intestine, which are called coccidiosis of large and small intestine respectively. [ABSTRACT FROM AUTHOR]