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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Rickettsia parkeri in the Pampa biome of southern Brazil: Isolation, molecular characterization, and serological evidence of canine infection

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Weck, Barbara [1, 2] ; Krawczak, Felipe S. [3] ; Costa, Francisco B. [4] ; Dall'Agnol, Bruno [2] ; Marcili, Arlei [5] ; Reck, Jose [2] ; Labruna, Marcelo B. [1]
Total Authors: 7
[1] Univ Sao Paulo, Dept Med Vet Prevent & Saude Anim, Sao Paulo - Brazil
[2] Inst Pesquisas Vet Desiderio Finamor IPVDF, Ctr Pesquisa Saude Anim, Eldorado Do Sul, RS - Brazil
[3] Univ Fed Goias, Escola Vet & Zootecnia, Setor Med Vet Prevent, Goiania, Go - Brazil
[4] Univ Estadual Maranhao, Dept Patol, Med Vet, Sao Luis, Maranhao - Brazil
[5] Univ Santo Amaro, Med & Bem Estar Anim, Sao Paulo, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Web of Science Citations: 1

In this work we performed a field study in a spotted fever-endemic area of the Pampa biome in Rio Grande do Sul, the southernmost state of Brazil (Rosario do Sul municipality), with the aim to evaluate the serological status of dogs for spotted fever group (SFG) rickettsiae, to attempt the isolation rickettsiae from A. tigrinum ticks, and to further perform a multi-genic molecular characterization of the rickettsial isolate. For this purpose, we collected blood serum samples and ticks from 18 rural dogs during 2016-2017. By immunofluorescence assay, all 18 dogs (100%) reacted serologically to SFG rickettsiae, with highest endpoint titers to R. parkeri, suggesting that at least part of these dogs have been infected by R. parkeri. Among 23 ticks collected from the dogs (13 A. tigrinum and 10 Rhipicephalus sanguineus sensu stricto), 46% (6/13) A. tigrinum contained DNA of R. parkeri, which was successfully isolated in Vero cell culture from one of these ticks. Partial sequences of five genes (gltA, ompA, virB4, dnaA, dnaK) and 3 intergenic spacers (mppA-purC, rrl-rrf-ITS, rpmE-tRNA(fMet)) were generated from this rickettsial isolate, and were all 100% identical to corresponding sequences of R. parkeri s.s. We provide the first report of a viable isolate of R. parkeri from A. tigrinum, confirming that this isolate belongs to the strain R. parkeri s.s., as it has already been demonstrated for other two tick species of the Amblyomma maculatum species complex (A. maculatum and Amblyomma triste). (AU)

FAPESP's process: 17/04249-4 - Survey of tick-borne agents (Anaplasma spp, Babesia spp, Borrelia spp, Ehrlichia spp and Hepatozoon spp) in small mammals and their ticks in endemic and non-endemic areas for Brazilian spotted fever in the state of São Paulo, Brazil.
Grantee:Bárbara Conte Weck
Support type: Scholarships in Brazil - Doctorate