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Am. J. Trop. Med. Hyg., 36(3), 1987, pp. 517-522
Copyright © 1987 by The American Society of Tropical Medicine and Hygiene

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Cyst Rupture as a Pathogenic Mechanism of Toxoplasmic Encephalitis

J. K. Frenkel AND A. Escajadillo
University of Kansas Medical Center, Kansas City, Kansas 66103 and Gorgas Memorial Laboratory, Panama City, Republic of Panama

Seemingly intact cysts and sequential stages of disintegrating cysts of Toxoplasma were identified immunohistologically within developing microglial nodules in a Panamanian night monkey (Aotus lemurinus). This monkey had been successfully immunized and challenged 5 months earlier. This supports the hypothesis that glial nodules unassociated with Toxoplasma tachyzoites may represent the tombstone of a Toxoplasma cyst. Disintegration of cysts may give rise to clinical encephalitis in the presence of apparently adequate immunity.

Accepted for publication November 21, 1986.




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Copyright © 1987 by the American Society of Tropical Medicine and Hygiene.