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Epidemiological, Imunological and Molecular Investigation of Leishmania (Leishmania) chagasi in Rhipicephalus sanguineus ticks in dogs from São Paulo and Mato Grosso do Sul States

Grant number: 12/00266-8
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): March 01, 2012
Effective date (End): February 28, 2015
Field of knowledge:Agronomical Sciences - Veterinary Medicine - Preventive Veterinary Medicine
Principal researcher:Katia Denise Saraiva Bresciani
Grantee:Milena Araúz Viol
Home Institution: Faculdade de Medicina Veterinária (FMVA). Universidade Estadual Paulista (UNESP). Campus de Araçatuba. Araçatuba , SP, Brazil


The first aim of this study is to lead an epidemiological investigation by the polymerase chain reaction (PCR) which allows the detection of Leishmania (Leishmania) chagasi in individual Rhipicephalus sanguineus ticks from positive and negative dogs to canine visceral leishmaniasis through serological, parasitological and molecular assays. The second objective will determine the role of the tick as intermediary host of the protozoan mentioned above. A total of 99 dogs will be used, with 66 seropositive for this agent from two endemic municipalities (33 of Araçatuba, São Paulo (SP) and 33 from Campo Grande, Mato Grosso do Sul) and 33 seronegative (from Jaboticabal, SP, non-endemic area). These animals, both male and female, of different breeding and with age more than one year. Blood samples will be processed by the techniques of Immunofluorescence Assay (IFA) and enzyme linked immunosorbent assay (ELISA). Aspiration biopsies will be performed for the direct parasitological examination "imprint" of lymph nodes and after that this material will be examined by Polymerase Chain Reaction (PCR). In the whole of 10 ticks of R. sanguineus species will be collected from each dog. Genomic DNA will be purified from the guts, ovaries, salivary glands and eggs of the individual ticks and the PCR assay will be used to verify the presence or absence of Leishmania (Leishmania) chagasi. It will be also performed immunohistochemistry reaction of those same organs. Due to absence of the epidemiological studies concerning the occurrence of this protozoan in this species of ticks and because of their inconclusive role as intermediary host, justifies the performance of this research. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
VIOL, MILENA ARAUZ; GUERRERO, FELIX D.; MIRANDA DE OLIVEIRA, BRUNO CESAR; COSTA DE AQUINO, MONALLY CONCEICAO; LOIOLA, SAULO HUDSON; DE MELO, GUILHERME DIAS; DE SOUZA GOMES, APARECIDA HELENA; KANAMURA, CRISTINA TAKAMI; GARCIA, MARCOS VALERIO; ANDREOTTI, RENATO; et al. Identification of Leishmania spp. promastigotes in the intestines, ovaries, and salivary glands of Rhipicephalus sanguineus actively infesting dogs. Parasitology Research, v. 115, n. 9, p. 3479-3484, . (12/00266-8)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)

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