| Autor: |
Albuquerque MP; Faculdade de Saúde Pública, Universidade de São Paulo - USP, São Paulo, SP, Brasil., Horta MC; Universidade Federal do Vale do São Francisco - UNIVASF, Petrolina, PE, Brasil., Melo DRX; Faculdade de Saúde Pública, Universidade de São Paulo - USP, São Paulo, SP, Brasil., Takeda GACG; Faculdade de Saúde Pública, Universidade de São Paulo - USP, São Paulo, SP, Brasil., Arraes-Santos AI; Universidade Federal do Vale do São Francisco - UNIVASF, Petrolina, PE, Brasil., Martins TF; Instituto Pasteur, São Paulo, SP, Brasil.; Faculdade de Medicina Veterinária e Zootecnia - FMVZ, Universidade de São Paulo - USP, São Paulo, SP, Brasil., Pinter A; Faculdade de Saúde Pública, Universidade de São Paulo - USP, São Paulo, SP, Brasil.; Faculdade de Medicina Veterinária e Zootecnia - FMVZ, Universidade de São Paulo - USP, São Paulo, SP, Brasil. |
| Abstrakt: |
In Brazil, spotted fever (SF) is caused by two species of Rickettsia, both of which are transmitted by Amblyomma ticks: Rickettsia rickettsii, which results in severe and often fatal cases, and Rickettsia parkeri, which causes a mild illness. This study focused on R. parkeri in Amblyomma ovale ticks from the Maciço de Baturité region, Ceará, Northeast Brazil, an area endemic for SF with mild symptoms. We examined 60 domestic dogs with access to the forest for ticks and Rickettsia seroprevalence. A landscape analysis was conducted in all forest patches within 2-10 km from the main forest edge. In total, 125 A. ovale ticks were collected from 30 dogs (50%). DNA from 65 ticks was tested using genus-specific Rickettsia primers. Three (4.6%) tick specimens tested positive for R. parkeri while the Rickettsia seroprevalence among the dogs was 55% (33/60). A probable occurrence of Rickettsia transmission was observed in the fragmented Atlantic rainforest, which has 1,019 ha of preserved land and 50.6 km of perimeter border. The land's characteristics allow for semi-domiciled dogs to access forest fragments, where A. ovale ticks are commonly present. Infected ticks may parasitize the dogs, which then transport the ticks into homes, potentially transmitting SF-causing bacteria to humans. |
