| unrecognized spotted fever group rickettsiosis masquerading as dengue fever in mexico. | although rocky mountain spotted fever was documented in northern mexico during the 1940s, spotted fever group (sfg) rickettsioses have subsequently received little attention in mexico. in this study, sera collected in 1993 from 50 patients from the mexican states of yucatan and jalisco, who were suspected clinically to have dengue fever but had no antibodies to dengue virus, were examined by indirect immunofluorescence for igm antibodies reactive with rickettsia rickettsii, r. akari, and r. typh ... | 1996 | 8780453 |