In vitro development from sporozoites to first-generation merozoites in Eimeria contorta Haberkorn, 1971. A fine structural study.

Zeitschrift Für Parasitenkunde
B E Müller

Abstract

The asexual development of Eimeria contorta from sporozoites to first-generation merozoites in tissue culture was investigated with the electron microscope. Sporozoites with a three-layered pellicle, 26 subpellicular microtubules, a conoid, 4-7 rhoptries, and an abundance of micronemes actively entered host cells and showed direct contact to the host cell's cytoplasm. Shortly after penetration, small vacuoles surrounding the parasite merged into a parasitophorous vacuole. Inside this vacuole, sporozoites assumed a definite U-shape before transformation into schizonts took place. This process was characterised by the occurrence of subpellicular microtubules exclusively in the anterior half of the sporozoite, by a degeneration of the 2 inner pellicular membranes, by an outpocketing of the parasite's surface, and by the arrangement of microtubules in clusters. About 25 merozoites were formed at the surface of mature schizonts, to which they remained attached at their posterior pole. A polar ring was present at that area. Anterior and posterior refractile bodies were conspicuous in merozoites and showed close association with mitochondria. The significance of a fibrillar substructure in rhoptries and micronemes is discussed, and sp...Continue Reading

References

Oct 1, 1974·The Journal of protozoology·J F RyleyJ R Stark
Jan 1, 1970·Zeitschrift Für Parasitenkunde·E Scholtyseck
Jan 1, 1972·Zeitschrift Für Parasitenkunde·G L Kelley, D M Hammond
Jan 1, 1972·Zeitschrift Für Parasitenkunde·E ScholtyseckJ Sénaud
May 1, 1972·The Journal of protozoology·T R Klei
Jan 1, 1971·Zeitschrift Für Parasitenkunde·A Haberkorn
Nov 1, 1967·The Journal of protozoology·D M HammondB Chobotar

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