Document Detail

Sarcocystis neurona (Protozoa: Apicomplexa): description of oocysts, sporocysts, sporozoites, excystation, and early development.
MedLine Citation:
PMID:  15272465     Owner:  NLM     Status:  MEDLINE    
Equine protozoal myeloencephalitis is a major cause of neurological disease in horses from the Americas. Horses are considered accidental intermediate hosts. The structure of sporocysts of the causative agent, Sarcocystis neurona, has never been described. Sporocysts of S. neurona were obtained from the intestines of a laboratory-raised opossum fed skeletal muscles from a raccoon that had been fed sporocysts. Sporocysts were 11.3 by 8.2 microm and contained 4 sporozoites. The appearance of the sporocyst residuum was variable. The residuum of some sporocysts was composed of many dispersed granules, whereas some had granules mixed with larger globules. Excystation was by collapse of the sporocyst along plates. The sporocysts wall was composed of 3 layers: a thin electron-dense outer layer, a thin electron-lucent middle layer, and a thick electron-dense inner layer. The sporocyst wall was thickened at the junctions of the plates. Sporozoites were weakly motile and contained a centrally or posteriorly located nucleus. No retractile or crystalloid body was present, but lipidlike globules about 1 microm in diameter were usually present in the conoidal end of sporozoites. Sporozoites contained 2-4 electron-dense rhoptries and other organelles typical of coccidian zoites. Sporozoites entered host cells in culture and underwent schizogony within 3 days.
David S Lindsay; Sheila M Mitchell; M C Vianna; J P Dubey
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Journal of parasitology     Volume:  90     ISSN:  0022-3395     ISO Abbreviation:  J. Parasitol.     Publication Date:  2004 Jun 
Date Detail:
Created Date:  2004-07-23     Completed Date:  2004-07-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7803124     Medline TA:  J Parasitol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  461-5     Citation Subset:  IM    
Department of Biomedical Sciences and Pathobiology, Virginia-Maryland Regional College of Veterinary Medicine, Virginia Tech, Blacksburg, 24061-0342, USA.
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MeSH Terms
Cell Line
Cercopithecus aethiops
Horse Diseases / parasitology
Microscopy, Electron / veterinary
Microscopy, Electron, Scanning / veterinary
Opossums / parasitology*
Sarcocystis / growth & development*,  physiology,  ultrastructure
Sarcocystosis / parasitology,  veterinary*

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