The expanding spectrum of eschar-associated rickettsioses in the United States.

BACKGROUND Until recently, Rickettsia rickettsii was the only substantiated cause of tick-borne spotted fever group (SFG) rickettsiosis in humans in the United States. Rickettsia parkeri, originally thought to be nonpathogenic in humans, was recently proved to be another cause of tick-borne SFG rickettsiosis. OBSERVATIONS We report 3 cases of SFG… CONTINUE READING