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Gametogony of Eimeria macusaniensis Guerrero, Hernandez, Bazalar and Alva, 1971 in llama (Lama glama)

Published online by Cambridge University Press:  12 April 2018

J P. Dubey
J P. Dubey*
Affiliation:
United States Department of Agriculture, Agricultural Research Service, Animal Parasitic Diseases Laboratory, Beltsville Agricultural Research Center, Beltsville, Maryland 20705-2350, USA
*
Author for correspondence: J P. Dubey, E-mail: [email protected]
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Abstract

Camelids (llama, alpaca, vicunãs, guanacos) are important for the economy of South America and Eimeria infections are an important cause of mortality in camelids. Of the six species of Eimeria in camelids, Eimeria macusaniensis, considered the most pathogenic, is distinctive; its oocysts are the largest among all Eimeria species in animals, its prepatent period is more than 1 month, and its oocysts have been found in mummies from prehistoric times. Although, E. macusaniensis gametogonic stages are found associated with enteritis in naturally infected camelids, the schizogonic stages are unknown and clinical disease has been reported in some camelids with no oocysts in feces. Described herein are morphological details of gametogonic development and oocyst formation of E. macusaniensis in a naturally infected llama (Lama lama), solely infected with this parasite. Microgamonts, macrogamonts and oocysts were located in large (up to 300 µm diameter) parasitophorous vacuoles of enterocytes in the ileum. Schizonts were not found. Review of previous reports suggests that multinucleated microgamonts have been mistaken for schizonts. Gametogonic development described in the present study can serve as a guide for differential diagnosis of Eimeria species in the histological sections of intestines.

Keywords

Eimeria macusaniensisLama glamamacrogamontsmicrogamontsoocysts
Type
Research Article
Information
Parasitology , Volume 145 , Issue 12 , October 2018 , pp. 1540 - 1547
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Creative Commons
This is a work of the U.S. Government and is not subject to copyright protection in the United States.
Copyright
Copyright © Cambridge University Press 2018

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