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Eimeria media Kessel 1929: comparative study of endogenous development between precocious and parental strains
Abstract:
Endogenous development of a pure strain of Eimeria media and of a precocious line derived from this strain was studied in specific pathogen-free (SPF) rabbits. Endogenous development of the parental strain comprised 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 numbers. Multiplication was carried out by endomerogony. Within type B meronts, merozoites arose from ectomerogony. These were slender and more numerous than those of type A. The sporozoite refractile body was divided 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 refractile body was observed and the last merogony was absent. Gamogony appeared 60 h pi.
Insights
This study details the endogenous development of Eimeria media in rabbits, revealing distinct meront types and generational differences in sporozoite refractile bodies. A precocious line showed accelerated gamogony and lacked the final merogony.
Area of Science:
- Parasitology
- Microbiology
- Animal Health
Background:
- Eimeria species are significant protozoan parasites causing coccidiosis in various animals.
- Understanding the endogenous life cycle is crucial for developing effective control strategies.
- Eimeria media is a less-studied species, necessitating detailed investigation of its development.
Purpose of the Study:
- To characterize the endogenous development of a pure strain of Eimeria media.
- To investigate the life cycle of a precocious line derived from Eimeria media.
- To compare the developmental stages and timelines between the parental and precocious strains.
Main Methods:
- Infection of specific pathogen-free (SPF) rabbits with Eimeria media.
- Microscopic observation of endogenous parasite development at various time points post-inoculation.
- Identification and characterization of different meront types and their developmental products.
Main Results:
- The parental strain exhibited three endogenous generations with gamogony starting at 76 hours post-inoculation (pi).
- Two meront types (A and B) were observed, differing in merozoite size, number, and origin (endo- vs. ectomerogony).
- The precocious line showed accelerated gamogony (60 h pi), absence of the final merogony, and lacked the sporozoite refractile body.
Conclusions:
- Eimeria media displays complex endogenous development with distinct meront types influencing merozoite characteristics.
- The sporozoite refractile body is present in early but not late filial generations.
- The precocious line represents a distinct developmental variant with potential implications for parasite biology and transmission.