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Serological survey of Rickettsia in equids from Vale do Paraíba, São Paulo, Brazil, and their tick identification and molecular investigation of Rickettsia
2019
Claudia Iorio Budweg | Amanda Oliveira de Sousa | Tânia Regina Vieira de Carvalho | Zahi Êni Santos Souza | Maria Carolina de Azevedo Serpa | Thiago Fernandes Martins | Fernanda Nieri-Bastos | Arlei Marcili | Marcelo Bahia Labruna | Jonas Moraes-Filho
Brazilian spotted fever is a serious and lethal illness for humans and is caused by the Rickettsia rickettsii bacteria. In the state of São Paulo/SP (Brazil), the etiological agent of this disease is transmitted by the Amblyomma sculptum tick. It was already shown that horses infected with this bacteria produce a strong immune response and could be important sentinels for the detection of the disease in a proper region. The present investigation performed a serological survey in horses from five farms of Vale do Paraíba, São Paulo state, Brazil, searching for antibodies against, Rickettsia rickettsii, Rickettsia parkeri, Rickettsia amblyommatis, Rickettsia rhipicephali, and Rickettsia bellii. In each farm, ticks were also collected that were taxonomically identified and examined by real-time PCR for Rickettsia spp DNA. Blood samples were collected from 206 horses, and 334 ticks were picked up from these animals from January to December 2017. Eighty ticks wereA. sculptum and 254 Dermacentor nitens. Of the blood samples, 7.3% seroconverted to Rickettsia spp. Of these, 0.97% had a positive serological response to R. bellii. None of the 80 A. sculptum ticks were positive through real-time PCR for Rickettsia spp. Although there was no detection of ticks infected by Rickettsia spp in five farms of Paraíba Valley, the horses presented serological positive reactions against this agent. Thus, further large studies should be conducted in the area targeting hosts and vectors to generate data for control measures of the transmission of Brazilian spotted fever.
Afficher plus [+] Moins [-]Ticks on crested francolins, Francolinus sephaena, and on the vegetation on a farm in Limpopo Province, South Africa
2005
Uys, A.C. | Horak, I.G. (Pretoria Univ., Onderstepoort (South Africa). Dept. of Veterinary Tropical Diseases)
Parasites of domestic and wild animals in South Africa. XXXVII. Ixodid ticks on cattle on Kikuyu grass pastures and in Valley Bushveld in the Eastern Cape Province [South Africa]
1999
Horak, I.G. (Pretoria Univ., Onderstepoort (South Africa). Dept. of Veterinary Tropical Diseases)
The distribution of heartwater in the highveld of Zimbabwe, 1980-1997
1998
Peter, T.F. (Florida Univ., Harare (Zimbabwe). USAID/SADC Heartwater Research Project) | Perry, B.D. | O'Callaghan, C.J. | Medley, G.F. | Shumba, W. | Madzima, W. | Burridge, M.J. | Mahan, S.M.
