[Remarks on the pathogenicity of Eimeria species exemplified by cattle coccidiosis].

Development and pathogenicity of the coccidia of cattle are known up to this day only for some species. The criteria responsible for pathogenicity of the species of Eimeria, which are arranged in the complexes "Biological qualities of the species of coccidia", "Factors of environment and stress" and "Situation of reaction of the host" are discussed. Thereby it is emphasized that in coccidiosis of calves and young cattles, especially conditions of environment are important for the outbreak or not of this disease.