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Journal of Veterinary Diagnostic Investigation Vol. 19 Issue 3, 317-322
Copyright © 2007 by the American Association of Veterinary Laboratory Diagnosticians
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Brief Communication

Infections Caused by Pathogenic Free-living Amebas (Balamuthia Mandrillaris and Acanthamoeba Sp.) In Horses

Hailu Kinde1, Deryck H. Read, Barbara M. Daft, Michael Manzer, Robert W. Nordhausen, Daryl J. Kelly, Paul A. Fuerst, Gregory Booton and Govinda S. Visvesvara

Correspondence: 1Corresponding Author: Hailu Kinde, CAHFS San Bernardino Branch, 105 West Central Avenue, San Bernardino, CA 92408, e-mail: hkinde{at}ucdavis.edu

This article describes amebic infections in 4 horses: granulomatous amebic encephalitis caused by Balamuthia mandrillaris and Acanthamoeba culbertsoni and systemic infections caused by Acanthamoeba sp. The former infection occurred in 1 of 4 horses spontaneously without any underlying conditions; the latter amebic infection was perhaps "opportunistic" considering the visceral involvement by this protozoan in association with Aspergillus sp. and/or Escherichia coli and Pseudomonas sp. The clinicopathologic findings and demonstration of the amebic organisms using immunohistochemical techniques, culture, polymerase chain reactions, and electron microscopy are presented.

Key Words: Acanthamoeba culbertsoni • Balamuthia mandrillaris • granulomatous amebic encephalitis






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