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Article
July 1990

Rocky Mountain Spotted Fever and Human Ehrlichiosis—United States, 1989 Rocky Mountain Spotted Fever

Arch Dermatol. 1990;126(7):859. doi:10.1001/archderm.1990.01670310016001
Abstract

IN 1989, state health departments reported 603 cases of Rocky Mountain spotted fever (RMSF) to CDC, a 2.0% decrease from the 615 cases reported in 1988. The incidence rate was 0.25 per 100 000 persons. Of the 603 cases, 224 (37.1%) were reported from the South Atlantic region and 100 (16.6% ) from the West South Central region. Oklahoma had the highest rate (62 cases, 1.9 per 100 000); other states with high rates were North Carolina (118 cases, 1.8 per 100 000), Montana (14 cases, 1.8 per 100 000), South Carolina (40 cases, 1.1 per 100 000), and Missouri (53 cases, 1.0 per 100 000).

Detailed case reports were submitted on 487 (80.8% ) cases. Of these, 300 (61.6%) were laboratory-confirmed,* 15 (3.1%) were classified as probable,** and 172 (35.3%) were not confirmed. Of the 487 cases, males accounted for 63.1% of cases. For 78.3% of cases, onset of symptoms occurred

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