TY - JOUR AU - Sangioni, Luis A. AU - Horta, Maurício C. AU - Vianna, Manoella C.B. AU - Gennari, Solange M. AU - Soares, Rodrigo M. AU - Galvão, Márcio A.M. AU - Schumaker, Teresinha T.S. AU - Ferreira, Fernando AU - Vidotto, Odilon AU - Labruna, Marcelo B. T1 - Rickettsial Infection in Animals and Brazilian Spotted Fever Endemicity T2 - Emerging Infectious Disease journal PY - 2005 VL - 11 IS - 2 SP - 265 SN - 1080-6059 AB - We compared the rickettsial infection status of Amblyomma cajennense ticks, humans, dogs, and horses in both Brazilian spotted fever (BSF)–endemic and –nonendemic areas in the state of São Paulo, Brazil. Most of the horses and few dogs from BSF-endemic areas had serologic titers against Rickettsia rickettsii antigens. In contrast, no dogs or horses from BSF-nonendemic areas had serologic titers against R. rickettsii antigens, although they were continually exposed to A. cajennense ticks. All human serum samples and ticks from both areas were negative by serologic assay and polymerase chain reaction, respectively. Our results indicate that surveys of horse serum are a useful method of BSF surveillance in areas where humans are exposed to A. cajennense ticks. In addition, we successfully performed experimental infection of A. cajennense ticks with R. parkeri. KW - Brazilian spotted fever KW - Rickettsia rickettsii KW - Rickettsia parkeri KW - ticks KW - Amblyomma cajennense KW - surveillance KW - research KW - Brazil DO - 10.3201/eid1102.040656 UR - https://wwwnc.cdc.gov/eid/article/11/2/04-0656_article ER - End of Reference