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Equine protozoal myeloencephalitis caused by Sarcocystis neurona infection.

Sarcocystis neurona stages and lesions.

(A). Cross section of spinal cord of horse with focal areas of discoloration (arrows) indicative of necrosis. Unstained.

(B). Section of spinal cord of a horse with severe EPM. Necrosis, and a heavily infected neuron (arrows), all dots (arrows) are merozoites. H and E stain .

(C). Higher magnification of a dendrite with numerous merozoites (arrows). One extracellular merozoite (arrowhead) and a young schizont (double arrowhead).

(D). Section of brain of an experimentally-infected mouse stained with anti-S. neurona antibodies. Note numerous merozoites (arrows).

(E). Immature schizonts in cell culture. A schizont with multilobed nucleus (arrow) and a schizont with differentiating merozoites (arrowheads). Giemsa stain.

(F). Mature sarcocysts with hairlike villar protrusions (double arrowheads) on the sarcocyst wall. H and E stain.

(G). Mature live sarcocyst with numerous septa (arrows) and hairlike protrusions on the sarcocyst wall (double arrowheads). Unstained.

(H). An oocyst with two sporocysts each with banana-shaped sporozoites. Unstained.

Source:USDA Agricultural Research Service page on EPM/Sarcocystis neurona [1]


Public domain This image is in the public domain because it contains materials that originally came from the Agricultural Research Service, the research agency of the United States Department of Agriculture.

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Equine protozoal myeloencephalitis stages and lesions (see WikiCommons for details).

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current22:49, 3 July 2007Thumbnail for version as of 22:49, 3 July 2007329 × 336 (151 KB)Joelmills[http://en.wikipedia.org/wiki/Equine_Protozoal_Myeloencephalitis Equine protozoal myeloencephalitis] caused by ''Sarcocystis neurona'' infection. ''Sarcocystis neurona'' stages and lesions. (A). Cross section of spinal cord of horse with focal areas of

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