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Epidemiology of Rocky Mountain Spotted Fever in Ohio, 1981: Serologic Evaluation of Canines and Rickettsial Isolation from Ticks Associated with Human Case Exposure Sites^*

John C. Gordon, Scott W. Gordon, Ellen Peterson AND Robert N. Philip

Department of Veterinary Preventive Medicine, College of Veterinary Medicine, The Ohio State University, Columbus, Ohio 43210
Vector-Borne Disease Unit, Ohio Department of Health, Columbus, Ohio 43215
Epidemiology Branch, Rocky Mountain Laboratory, National Institutes of Health, Hamilton, Montana 59840

A survey for the prevalence of Rocky Mountain spotted fever (RMSF) antibodies in dogs associated with confirmed human cases in Ohio was conducted during 1981. Twelve of 14 confirmed cases (85%) had a history of dog association prior to onset of RMSF. A total of 29 dogs were included in the study, with 16 dogs providing serum samples for antibody testing and the remainder providing tick samples. Serum samples tested by indirect microimmunofluorescence techniques revealed 12/16 dogs (75%) to be seropositive for Rickettsia rickettsii. A total of 310 ticks were collected from study dogs and the vegetation surrounding RMSF case exposure sites. Twenty-two (7.1%) of these ticks (all Dermacentor variabilis) were found to be infected with spotted fever group rickettsiae. Four ticks (1.3%) were infected with R. rickettsii, 13 (4.2%) with Rickettsia montana, and four (1.3%) with Rickettsia bellii. R. montana, a nonpathogen, was the only rickettsia found in dogs (antibodies) and ticks (isolation) associated with human cases in Southern Ohio.

Accepted for publication March 2, 1984.

^* Supported by a grant from the Ohio State University Graduate School (221431).

Data included in this study were summarized in the Data Forum, Journal of Infectious Diseases, 148(6), December 1983.

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