101831-36-1

Clazuril (2.5 mg/pigeon) results in a rapid suppression of oocyst excretion, but oocysts are again observed in the feces 20 days after treatment. The fact that oocysts appears again in the feces 3 to 5 weeks after treatment can probably be explained only by a persistence of endogenous stages, which are not affected during treatment, rather than by a reinfection ^[2].