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Comparative study on the acquisition of resistance in domestic dogs in two strains (Brazil and Argentina) of Rhipicephalus sanguineus (Acari: Ixodidae) following successive and controlled infestations

Grant number: 09/13234-4
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): April 01, 2011
Effective date (End): May 31, 2012
Field of knowledge:Agronomical Sciences - Veterinary Medicine - Animal Pathology
Principal Investigator:Gervasio Henrique Bechara
Grantee:Patricia Martinez Évora
Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil


Contrarily to results from laboratories elsewhere in US and Japan, data from our laboratory demonstrated in the 1990 decade that domestic dogs do not develop resistance against the brown dog Rhipicephalus sanguineus tick following repeated infestations or even after challenge infestation post-vaccination with crude tick extract. More recently, a comparative study between two populations of R. sanguineus from Brazil and Argentina showed marked biological, morphological and genetic differences between them; the Brazilian lineage seemed to be more phylogenetically related to the African R. turanicus while the Argentinean one seemed to be closest to the R. sanguineus from Europe; this explains at least partially the differences related above on the acquisition of resistance in dogs to this tick species. Continuing this line of research, we aim to investigate in a comparative way the possible resistance development in dogs after three successive and controlled infestations by adult R. sanguineus ticks, Jaboticabal lineage, Brazil, and Rafaela lineage, Argentina, through biological parameters determination, tick bite lesion's histopathology and serum antibody titration in each infestation. (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)
EVORA, PATRICIA MARTINEZ; SANCHES, GUSTAVO SERON; GOMES JUSI, MARCIA MARIZA; RODRIGUES ALVES, LUCAS BOCCHINI; MACHADO, ROSANGELA ZACARIAS; BECHARA, GERVASIO HENRIQUE. Lack of acquired resistance in dogs to successive infestations of Rhipicephalus sanguineus ticks from Brazil and Argentina. Experimental and Applied Acarology, v. 67, n. 1, p. 135-146, . (09/13234-4, 13/09792-7)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
ÉVORA, Patricia Martinez. Aquisição comparada de resistência em cães domésticos ao Rhipicephalus sanguineus (Acari: Ixodidae), linhagens brasileira e argentina, após infestações sucessivas. 2012. Master's Dissertation - Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agrárias e Veterinárias. Jaboticabal Jaboticabal.

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