Which of the following descriptions about the life cycle of Eimeria tenella is correct? （）

Which of the following descriptions about the life cycle of Eimeria tenella is correct? （）

A.Avian coccidiosis has a local distribution

B.Chickens get infected by consuming fodder or water that is contaminated by sporulated oocysts

C.A single species of Eimeria infection is commonly found in the field

D.Co-infection with more than one Eimeria species is rarely found in the field

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