EIMERIA-MEDIA KESSEL 1929 - COMPARATIVE-STUDY OF ENDOGENOUS DEVELOPMENT BETWEEN PRECOCIOUS AND PARENTAL STRAINS

Endogenous development of a pure strain of Eimeria media and of a prec ocious line derived from this strain was studied in specific pathogen- free (SPF) rabbits. Endogenous development of the parental strain comp rised three generations and the gamogony began 76 h post-inoculation ( pi). Two types of meronts were observed in each generation. The type A meronts gave rise to large, polynucleated merozoites present in low n umbers. Multiplication was carried out by endomerogony. Within type B meronts, merozoites arose from ectomerogony. These were slender and mo re numerous than those of type A. The sporozoite refractile body was d ivided and distributed into the first and second generation merozoites but not into the third. The endogenous development of the precocious line was similar to that of the parental strain except that no refract ile body was observed and the last merogony was absent. Gamogony appea red 60 h pi.