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Potomac Horse Fever: Neorickettsia (Ehrlichia) risticii
by Robert N. Oglesby DVM
Introduction
Introduction
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Transmission
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History and Signalment
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Symptoms
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A Diagnostic Challenge and Some Unusual Cases
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Treatment
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Prognosis
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Vaccination
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More Info
In 1979, a disease characterized by fever and diarrhea, during the hot months of the year was recognized in the Potomac river basin. It resembled other causes of diarrhea, but the inability to isolate known causes started veterinarians looking elsewhere. A bacteria-like organism was isolated from the infected horses blood and cells of the large colon. The ricketssial organism Neorickettsia (Ehrlichia) risticii was determined to be the cause of the disease. Since that time the organism has been identified serologically in 43 states of the US, the Canadian provinces of Saskatchewan Ontario and Nova Scotia, France, Italy, Venezuela, Brazil, Uganda, India, and Australia. However the organism has only been isolated from the US. This article discusses transmission, clinical signs, diagnosis, treatment and prognosis. Also vaccination and other prevention is discussed.
~Word Count: 2097 words (The average magazine page contains about 600 words);
~Last Updated: May 28, 2008;
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