“Oocysts passed in manure are tiny and much smaller than worm eggs,” Faries says. “They aren’t infectious at that stage. They have to sporulate and develop into four cells, each of which has two sporozoites. These eight sporozoites are the infective stage.” How long it takes for the oocyst to sporulate depends on weather and temperature. “If it’s cooler than 35°F, or hotter than 85°, development is prolonged. But at optimal temperatures, the ...

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