Artigo

Canine visceral leishmaniasis due to Leishmania (L.) infantum chagasi in Amazonian Brazil: comparison of the parasite density from the skin, lymph node and visceral tissues between symptomatic and asymptomatic, seropositive dogs

Canine visceral leishmaniasis (CVL) is recognizable by characteristic signs of disease and is highly lethal. The infection, however, may be quite inapparent in some seropositive dogs, and this has raised the polemic question as to whether or not such animals can be a source of infection for Lutzomyi...

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Autor principal: LIMA, Luciana Vieira Rego
Outros Autores: CARNEIRO, Liliane Almeida, CAMPOS, Marliane Batista, CHAGAS, Eujênia Janis, LAURENTI, Márcia Dalastra, CORBETT, Carlos Eduardo Pereira, LAINSON, Ralph, SILVEIRA, Fernando Tobias
Grau: Artigo
Idioma: eng
Publicado em: 2013
Assuntos:
Leishmaniose visceral canina
Leishmania infantum chagasi
Densidade parasitária
Pará - Estado
Amazônia brasileira
Acesso em linha: http://repositorio.ufpa.br/jspui/handle/2011/3844
id ir-2011-3844
recordtype dspace
spelling ir-2011-38442019-05-23T13:25:48Z Canine visceral leishmaniasis due to Leishmania (L.) infantum chagasi in Amazonian Brazil: comparison of the parasite density from the skin, lymph node and visceral tissues between symptomatic and asymptomatic, seropositive dogs Leishmaniose visceral canina causada por Leishmania (L.) infantum chagasi na Amazônia brasileira: comparação da densidade parasitária da pele, linfonodo e vísceras entre cães soropositivos, sintomáticos e assintomáticos LIMA, Luciana Vieira Rego CARNEIRO, Liliane Almeida CAMPOS, Marliane Batista CHAGAS, Eujênia Janis LAURENTI, Márcia Dalastra CORBETT, Carlos Eduardo Pereira LAINSON, Ralph SILVEIRA, Fernando Tobias Leishmaniose visceral canina Leishmania infantum chagasi Densidade parasitária Pará - Estado Amazônia brasileira Canine visceral leishmaniasis (CVL) is recognizable by characteristic signs of disease and is highly lethal. The infection, however, may be quite inapparent in some seropositive dogs, and this has raised the polemic question as to whether or not such animals can be a source of infection for Lutzomyia longipalpis, the vector of American visceral leishmaniasis (AVL). In this study we have examined 51 dogs with acute CVL from an AVL area in Pará State, northern Brazil, and compared the parasite density, amastigotes of Leishmania (L.) infantum chagasi, in the skin, lymph node and viscera of symptomatic with that of nine asymptomatic but seropositive dogs (IFAT-IgG). Post-mortem biopsy fragments of these tissues were processed by immunohistochemistry, using a polyclonal antibody against Leishmania sp. The X2 and Mann Whitney tests were used to evaluate the means of infected macrophage density (p < 0.05). There was no difference (p > 0.05) in the skin (10.7/mm2 x 15.5/mm2) and lymph node (6.3/mm2 x 8.3/mm2), between asymptomatic and symptomatic dogs, respectively. It was higher (p < 0.05), however, in the viscera of symptomatic (5.3/mm2) than it was in asymptomatic (1.4/mm2) dogs. These results strongly suggest that asymptomatic or symptomatic L. (L.) i. chagasi-infected dogs can serve as a source of infection, principally considering the highest (p < 0.05) parasite density from skin (10.7/mm2 x 15.5/mm2), the place where the vetor L. longipalpis takes its blood meal, compared with those from lymph node (6.3/mm2 x 8.3/mm2) and viscera (1.4/mm2x 5.3/mm2). A leishmaniose visceral canina (LVC) é reconhecida pelas características clínicas da doença e é altamente letal. A infecção, entretanto, pode ser totalmente assintomática em alguns cães soropositivos, o que tem levantado questão polêmica sobre a possibilidade desses animais, serem ou não uma fonte importante da infecção para o flebotomíneo, Lutzomyia longipalpis, o principal vetor da leishmaniose visceral americana (LVA). Neste estudo foram examinados 51 cães com LVC aguda, provenientes de área endêmica de LVA no Estado do Pará, Brasil, e a carga parasitária, formas amastigotas de, na pele, linfonodo poplíteo e vísceras (fígado e baço) foi comparada com a de nove cães assintomáticos soropositivos (IFAT-IgG). Fragmentos de biópsia desses tecidos obtidos post-mortem foram processados para análise através de imunohistoquímica, usando um anticorpo policlonal contra Leishmania sp. Os testes do Qui-quadrado (X2) e Mann Whitney foram usados para avaliar as médias da densidade de macrófagos infectados (p < 0,05). Os resultados mostraram que não houve diferença (p > 0,05) na densidade de macrófagos infectados da pele (10,7/mm2 x 15,5/mm2) e do linfonodo (6,3/mm2 x 8,3/mm2) entre cães assintomáticos e sintomáticos. Entretanto, a densidade de macrófagos infectados da víscera de cães sintomáticos (5,3/mm2) foi maior (p < 0,05) que a de cães assintomáticos (1,4/mm2). Estes resultados sugerem, fortemente, que cães naturalmente infectados por L. (L.) i. chagasi, assintomáticos ou sintomáticos, podem servir como fonte de infecção, principalmente, considerando-se que a densidade de macrófagos infectados da pele (10,7/mm2 x 15,5/mm2), local onde o flebotomíneo vetor Lu. longipalpis realiza a hematofagia, foi maior (p < 0,05) que as do linfonodo (6,3/mm2 x 8.3/mm2) e vísceras (1,4/mm2x 5,3/mm2). 2013-05-16T12:57:48Z 2013-05-16T12:57:48Z 2010-10 Artigo de Periódico LIMA, Luciana Vieira R., et al. Canine visceral leishmaniasis due to Leishmania (L.) infantum chagasi in Amazonian Brazil: comparison of the parasite density from the skin, lymph node and visceral tissues between symptomatic and asymptomatic, seropositive dogs. Revista do Instituto de Medicina Tropical de São Paulo, São Paulo, v. 52, n. 5, p. 259-265, set./out. 2010. Disponível em: <http://www.scielo.br/pdf/rimtsp/v52n5/a07v52n5.pdf>. Acesso em: 10 maio 2013. <http://dx.doi.org/10.1590/S0036-46652010000500007>. 0036-4665 1678-9946 http://repositorio.ufpa.br/jspui/handle/2011/3844 eng Acesso Aberto application/pdf
institution Repositório Institucional - Universidade Federal do Pará
collection RI-UFPA
language eng
topic Leishmaniose visceral canina
Leishmania infantum chagasi
Densidade parasitária
Pará - Estado
Amazônia brasileira
spellingShingle Leishmaniose visceral canina
Leishmania infantum chagasi
Densidade parasitária
Pará - Estado
Amazônia brasileira
LIMA, Luciana Vieira Rego
Canine visceral leishmaniasis due to Leishmania (L.) infantum chagasi in Amazonian Brazil: comparison of the parasite density from the skin, lymph node and visceral tissues between symptomatic and asymptomatic, seropositive dogs
topic_facet Leishmaniose visceral canina
Leishmania infantum chagasi
Densidade parasitária
Pará - Estado
Amazônia brasileira
description Canine visceral leishmaniasis (CVL) is recognizable by characteristic signs of disease and is highly lethal. The infection, however, may be quite inapparent in some seropositive dogs, and this has raised the polemic question as to whether or not such animals can be a source of infection for Lutzomyia longipalpis, the vector of American visceral leishmaniasis (AVL). In this study we have examined 51 dogs with acute CVL from an AVL area in Pará State, northern Brazil, and compared the parasite density, amastigotes of Leishmania (L.) infantum chagasi, in the skin, lymph node and viscera of symptomatic with that of nine asymptomatic but seropositive dogs (IFAT-IgG). Post-mortem biopsy fragments of these tissues were processed by immunohistochemistry, using a polyclonal antibody against Leishmania sp. The X2 and Mann Whitney tests were used to evaluate the means of infected macrophage density (p < 0.05). There was no difference (p > 0.05) in the skin (10.7/mm2 x 15.5/mm2) and lymph node (6.3/mm2 x 8.3/mm2), between asymptomatic and symptomatic dogs, respectively. It was higher (p < 0.05), however, in the viscera of symptomatic (5.3/mm2) than it was in asymptomatic (1.4/mm2) dogs. These results strongly suggest that asymptomatic or symptomatic L. (L.) i. chagasi-infected dogs can serve as a source of infection, principally considering the highest (p < 0.05) parasite density from skin (10.7/mm2 x 15.5/mm2), the place where the vetor L. longipalpis takes its blood meal, compared with those from lymph node (6.3/mm2 x 8.3/mm2) and viscera (1.4/mm2x 5.3/mm2).
format Artigo
author LIMA, Luciana Vieira Rego
author2 CARNEIRO, Liliane Almeida
CAMPOS, Marliane Batista
CHAGAS, Eujênia Janis
LAURENTI, Márcia Dalastra
CORBETT, Carlos Eduardo Pereira
LAINSON, Ralph
SILVEIRA, Fernando Tobias
author2Str CARNEIRO, Liliane Almeida
CAMPOS, Marliane Batista
CHAGAS, Eujênia Janis
LAURENTI, Márcia Dalastra
CORBETT, Carlos Eduardo Pereira
LAINSON, Ralph
SILVEIRA, Fernando Tobias
title Canine visceral leishmaniasis due to Leishmania (L.) infantum chagasi in Amazonian Brazil: comparison of the parasite density from the skin, lymph node and visceral tissues between symptomatic and asymptomatic, seropositive dogs
title_short Canine visceral leishmaniasis due to Leishmania (L.) infantum chagasi in Amazonian Brazil: comparison of the parasite density from the skin, lymph node and visceral tissues between symptomatic and asymptomatic, seropositive dogs
title_full Canine visceral leishmaniasis due to Leishmania (L.) infantum chagasi in Amazonian Brazil: comparison of the parasite density from the skin, lymph node and visceral tissues between symptomatic and asymptomatic, seropositive dogs
title_fullStr Canine visceral leishmaniasis due to Leishmania (L.) infantum chagasi in Amazonian Brazil: comparison of the parasite density from the skin, lymph node and visceral tissues between symptomatic and asymptomatic, seropositive dogs
title_full_unstemmed Canine visceral leishmaniasis due to Leishmania (L.) infantum chagasi in Amazonian Brazil: comparison of the parasite density from the skin, lymph node and visceral tissues between symptomatic and asymptomatic, seropositive dogs
title_sort canine visceral leishmaniasis due to leishmania (l.) infantum chagasi in amazonian brazil: comparison of the parasite density from the skin, lymph node and visceral tissues between symptomatic and asymptomatic, seropositive dogs
publishDate 2013
url http://repositorio.ufpa.br/jspui/handle/2011/3844
_version_ 1787148662107799552
score 11.675088

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