In vitro Cultivation of Sarcocystis neurona from the Spinal Cord of a Horse with Equine Protozoal Myelitis

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Abstract
Asexual stages of Sarcocystis neurona were seen in cultured bovine monocytes (M617) inoculated with tissue homogenates from the spinal cord of a horse with naturally acquired protozoal myelitis. Organisms first were observed as intracytoplasmic schizonts and later as motile extracellular zoites capable of infecting surrounding M617 cells. Parasites most often occurred as clusters of merozoites dispersed throughout the host cell cytoplasm; however, schizonts also contained merozoites arranged in a radial fashion surrounding a prominent residual body. Schizonts divided by endopolygeny. The parasite has been maintained beyond 280 days in the laboratory by serial passage of infected M617 cells.

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