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Veterinary Medicine International
Volume 2013 (2013), Article ID 982183, 5 pages
http://dx.doi.org/10.1155/2013/982183
Research Article

Canine Cutaneous Leishmaniasis: Dissemination and Tissue Tropism of Genetically Distinct Leishmania (Viannia) braziliensis Populations

1Laboratório de Epidemiologia e Sistemática Molecular, Instituto Oswaldo Cruz, FIOCRUZ, Avenida Brasil No. 4365, Manguinhos, 21040-360 Rio de Janeiro, RJ, Brazil
2Laboratório de Vigilância em Leishmanioses, Instituto de Pesquisa Clínica Evandro Chagas, FIOCRUZ, Avenida Brasil No. 4365, Manguinhos, 21040-360 Rio de Janeiro, RJ, Brazil

Received 14 February 2013; Revised 21 April 2013; Accepted 22 May 2013

Academic Editor: G. F. Browning

Copyright © 2013 Guilherme Marx de Oliveira et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Little is known regarding the internal dissemination of initial cutaneous lesions and tissue tropism of Leishmania (Viannia) braziliensis populations in naturally infected dogs. The aim of this study was to investigate genetic polymorphisms of L. (V.) braziliensis populations in different anatomic sites of naturally infected dogs by using polymerase chain reaction (PCR) and low-stringency single specific primer-PCR (LSSP-PCR) techniques. The amplified products were analyzed by LSSP-PCR to investigate the genetic variability of the parasite populations present in different anatomical sites. Twenty-three out of the 52 samples gave PCR-positive results. The existence of L. (V.) braziliensis strains that remained restricted to cutaneous lesions and others showing characteristics of dissemination to internal organs and healthy skin was observed. LSSP-PCR and numerical analyses revealed that parasite populations that do not disseminate were genetically similar and belonged to a separate phenetic cluster. In contrast, populations that showed spreading to internal organs displayed a more polymorphic genetic profile. Despite the heterogeneity, L. (V.) braziliensis populations with identical genetic profiles were observed in popliteal and cervical lymph nodes of the same animal. Our results indicate that infection in dogs can be manifested by dissemination and tissue tropism of genetically distinct populations of L. (V.) braziliensis.