Navegando por Autor "Soares, Rodrigo Martins"
Agora exibindo 1 - 2 de 2
Resultados por página
Opções de Ordenação
Item Rickettsial infection in animals and brazilian spotted fever endemicity.(2005) Sangioni, Luis Antônio; Horta, Maurício Cláudio; Vianna, Manoella Campostrini Barreto; Gennari, Solange Maria; Soares, Rodrigo Martins; Galvão, Márcio Antônio Moreira; Schumaker, Teresinha T. S.; Ferreira, Fernando; Vidotto, Odilon; Labruna, Marcelo BahiaWe 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.Item Rickettsial spotted fever in Capoeirão Village, Itabira, Minas Gerais, Brazil.(2008) Vianna, Manoella Campostrini Barreto; Horta, Maurício Cláudio; Sangioni, Luis Antônio; Cortez, Adriana; Soares, Rodrigo Martins; Mafra, Cláudio Lísias; Galvão, Márcio Antônio Moreira; Labruna, Marcelo Bahia; Gennari, Solange MariaThe present study investigated the infection by spotted fever rickettsia in an endemic area for Brazilian spotted fever (BSF; caused by Rickettsia rickettsii) in Minas Gerais State, Brazil. Human, canine and equine sera samples, and Amblyomma cajennense adult ticks collected in a rural area of Itabira City, Minas Gerais State were tested for rickettsial infection. Through Immunofluorescence Assay (IFA) we demonstrated the presence of antibodies anti-R. rickettsii in 8.2%, 81.3% and 100% of the human, canine and equine sera, respectively. None of the 356 tick specimens analyzed were positive for Rickettsia by the hemolymph test or Polymerase Chain Reaction technique (PCR) for the htrA and the gltA genes. Our serological results on horses and dogs (sentinels for BSF) appoint for the circulation of a SFG Rickettsia in the study area, however in a very low infection rate among the A. cajennense tick population.