Abstract
Rocky Mountain Spotted Fever (RMSF) is the most severe tick-borne ticks, presenting high lethality rates. In Brazil, the etiological agent of the disease, Rickettsia rickettsii, is transmitted to humans by the ticks Amblyomma sculptum (a species of the Amblyomma cajennense complex) and Amblyomma aureolatum. Although both species belong to the same genus and are important important vectors…