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Mode of transmission?
Normally, most birds pass small numbers of oocysts in their droppings without apparent ill effects. Coccidiosis becomes important as a disease when animals live, or are reared, under conditions that permit the build-up of infective oocysts (sporulated oocysts) in the environment. The intensive rearing of domestic chickens may provide these conditions. Young chickens pick up the infection from contaminated premises (soil, houses, utensils, etc.). These premises may have been contaminated previously by other young infected birds or by adult birds that have recovered from the condition. Wet areas around water fountains are a source of infection. Oocysts remain viable in litter for many months. In this way, they can contaminate a farm from year to year. Oocysts are killed by freezing, extreme dryness and high temperatures.
 
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