Spotted Fever Group Rickettsiae in Dermacentor variabilis from Cape Cod, Massachusetts

William C. FengDepartment of Microbiology and Department of Tropical Public Health, Harvard School of Public Health, U.S. Department of Health, Education, and Welfare, Public Health Service, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Epidemiology Branch, Rocky Mountain Laboratory, Boston, Massachusetts 02115

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Edward S. MurrayDepartment of Microbiology and Department of Tropical Public Health, Harvard School of Public Health, U.S. Department of Health, Education, and Welfare, Public Health Service, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Epidemiology Branch, Rocky Mountain Laboratory, Boston, Massachusetts 02115

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Willy BurgdorferDepartment of Microbiology and Department of Tropical Public Health, Harvard School of Public Health, U.S. Department of Health, Education, and Welfare, Public Health Service, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Epidemiology Branch, Rocky Mountain Laboratory, Boston, Massachusetts 02115

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Judith M. SpielmanDepartment of Microbiology and Department of Tropical Public Health, Harvard School of Public Health, U.S. Department of Health, Education, and Welfare, Public Health Service, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Epidemiology Branch, Rocky Mountain Laboratory, Boston, Massachusetts 02115

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Gail RosenbergDepartment of Microbiology and Department of Tropical Public Health, Harvard School of Public Health, U.S. Department of Health, Education, and Welfare, Public Health Service, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Epidemiology Branch, Rocky Mountain Laboratory, Boston, Massachusetts 02115

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Kamlesh DangDepartment of Microbiology and Department of Tropical Public Health, Harvard School of Public Health, U.S. Department of Health, Education, and Welfare, Public Health Service, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Epidemiology Branch, Rocky Mountain Laboratory, Boston, Massachusetts 02115

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Catherine SmithDepartment of Microbiology and Department of Tropical Public Health, Harvard School of Public Health, U.S. Department of Health, Education, and Welfare, Public Health Service, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Epidemiology Branch, Rocky Mountain Laboratory, Boston, Massachusetts 02115

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Charles SpickertDepartment of Microbiology and Department of Tropical Public Health, Harvard School of Public Health, U.S. Department of Health, Education, and Welfare, Public Health Service, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Epidemiology Branch, Rocky Mountain Laboratory, Boston, Massachusetts 02115

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Joseph L. WanerDepartment of Microbiology and Department of Tropical Public Health, Harvard School of Public Health, U.S. Department of Health, Education, and Welfare, Public Health Service, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Epidemiology Branch, Rocky Mountain Laboratory, Boston, Massachusetts 02115

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Spotted fever group (SFG) rickettsiae were identified by indirect immunofluorescent antibody tests in 1.1% of 6,956 specimens of Dermacentor variabilis collected on Cape Cod, Massachusetts. Forty-one of 45 rickettsial isolates were serotyped as Rickettsia montana, one as Rickettsia rickettsii, and three were unidentified. Studies of canines and humans with clinical evidence of spotted fever, and of healthy dogs with antibody to SFG rickettsiae, indicated that exposure of the canine population to R. montana was common but that R. montana was not involved in the etiology of spotted fever.

Author Notes

Deceased.

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