Comet assay demonstrate the damage in DNA of Eimeria spp. oocysts exposed to C-oo.Nc; (A&B) are control non-exposed oocysts; (C&D) low level of damage recorded in that exposed to 5 & 10 ppm/24h and (E&F) high level of damage in recorded in oocysts exposed to 40 ppm and Amprolium (20%) 240 ppm /24h.