Ultrastructure of developing Isospora suis in cultured cells

David S. Lindsay From the Department of Pathobiology, College of Veterinary Medicine, 166 Greene Hall, (Lindsay, Blagburn, Toivio-Kinnucan) and the Department of Animal Health Research, Alabama Agricultural Experiment Station, Auburn University, AL 36849-5519 (Blagburn).

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Byron L. Blagburn From the Department of Pathobiology, College of Veterinary Medicine, 166 Greene Hall, (Lindsay, Blagburn, Toivio-Kinnucan) and the Department of Animal Health Research, Alabama Agricultural Experiment Station, Auburn University, AL 36849-5519 (Blagburn).

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Maria Toivio-Kinnucan From the Department of Pathobiology, College of Veterinary Medicine, 166 Greene Hall, (Lindsay, Blagburn, Toivio-Kinnucan) and the Department of Animal Health Research, Alabama Agricultural Experiment Station, Auburn University, AL 36849-5519 (Blagburn).

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SUMMARY

The ultrastructure of Isospora suis sporozoites, type-1 meronts, and type-1 merozoites was examined, using transmission electron microscopy of infected cultured cells. The ultrastructure of sporozoites and type-1 merozoites was similar. Each possessed trimembranous pellicles, subpellicular microtubules, a conoid, anterior and posterior polar rings, rhoptries, micronemes, a single vesicular nucleus, tubular mitochondria, Golgi complexes, ribo-somes, endoplasmic reticula, inactive micropores, amylopectin bodies, lipid bodies, dense bodies, and crystalloid bodies. Merozoites were produced by endodyogeny. Ultrastructural events associated with merozoite production by type-1 meronts are described.

SUMMARY

The ultrastructure of Isospora suis sporozoites, type-1 meronts, and type-1 merozoites was examined, using transmission electron microscopy of infected cultured cells. The ultrastructure of sporozoites and type-1 merozoites was similar. Each possessed trimembranous pellicles, subpellicular microtubules, a conoid, anterior and posterior polar rings, rhoptries, micronemes, a single vesicular nucleus, tubular mitochondria, Golgi complexes, ribo-somes, endoplasmic reticula, inactive micropores, amylopectin bodies, lipid bodies, dense bodies, and crystalloid bodies. Merozoites were produced by endodyogeny. Ultrastructural events associated with merozoite production by type-1 meronts are described.

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