An acutely ill 4-year-old girl with Rocky Mountain spotted fever (RMSF) was found to have a coagulation inhibitor. This child had no serious bleeding manifestations and minimal hemorrhagic skin manifestations despite severe RMSF, concurrent thrombocytopenia, as well as the coagulation inhibitor. Hemostatic abnormalities that occur with RMSF as well as other infectious illnesses associated with coagulation inhibitors are reviewed.
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