The monograph summarizes the author's own long-term research and scattered data available in the literature on parasitocenosis of Eimeria and Strongyloides. The book describes the species composition of sheep parasitocenoses formed from Eimeria and Strongyloides, morphology, development cycles of parasites-joints of parasitocenoses, provides data on seasonal, age and zonal dynamics of infection with these joints of sheep parasitocenoses. The book is intended for graduate students, doctoral students, researchers Parasitologists and teachers.