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Evidence of a Serologic Relationship between Ehrlichia Canis and Rickettsia Sennetsu

Miodrag RisticCollege of Veterinary Medicine, University of Illinois, U.S. Army Medical Research Unit, Miyazaki Medical School, Walter Reed Army Institute of Research, Urbana, Illinois 61801, Japan

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David L. HuxsollCollege of Veterinary Medicine, University of Illinois, U.S. Army Medical Research Unit, Miyazaki Medical School, Walter Reed Army Institute of Research, Urbana, Illinois 61801, Japan

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Nobuyoshi TachibanaCollege of Veterinary Medicine, University of Illinois, U.S. Army Medical Research Unit, Miyazaki Medical School, Walter Reed Army Institute of Research, Urbana, Illinois 61801, Japan

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Garrison RapmundCollege of Veterinary Medicine, University of Illinois, U.S. Army Medical Research Unit, Miyazaki Medical School, Walter Reed Army Institute of Research, Urbana, Illinois 61801, Japan

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A serologic relationship between Rickettsia sennetsu, the etiologic agent of human sennetsu rickettsiosis in western Japan, and Ehrlichia canis, the agent of canine ehrlichiosis, has been demonstrated. Using the indirect fluorescent antibody test, convalescent sera from patients with sennetsu fever reacted with Ehrlichia canis antigen. In the direct fluorescent antibody test, immunoglobulins from four patients with sennetsu rickettsiosis stained E. canis morulae in canine monocytes. This finding is significant in view of the morphologic uniqueness of the two agents and a lack of serologic relatedness with other major rickettsial agents.

Author Notes

Present address: HQ U.S. Army Medical Research and Development Command, Fort Detrick, Frederick, Maryland 21701.

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