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      Infecção natural de Lutzomyia longipalpis por Leishmania sp. em Teresina, Piauí, Brasil Translated title: Natural infection of Lutzomyia longipalpis by Leishmania sp. in Teresina, Piauí State, Brazil

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          Abstract

          No Brasil, o controle do vetor Lutzomyia longipalpis é uma das principais estratégias utilizadas para limitar a expansão da leishmaniose visceral americana. Entretanto, poucos são os estudos sobre a infecção natural destes flebotomíneos por espécies de Leishmania. Um estudo sobre a infecção natural de Lu. longipalpis por Leishmania sp. foi realizado no bairro Bela Vista, Teresina, Piauí, um dos principais focos urbanos da leishmaniose visceral americana no Brasil. Entre fevereiro de 2004 e janeiro de 2005 realizaram-se 180 capturas usando-se armadilhas luminosas do tipo CDC. Foram dissecadas e examinadas, em média, dez fêmeas por captura para detecção de formas evolutivas de Leishmania sp., identificando-se 1.832 exemplares de Lu. longipalpis e seis de Lu. whitmani. Vinte (1,1%) espécimes, todas de Lu. longipalpis, estavam infectadas com as formas procíclica e nectomonada de Leishmania sp., localizadas, principalmente, na porção posterior do trato digestivo. O maior percentual de insetos infectados foi encontrado quatro meses após o período de maior precipitação pluviométrica, sugerindo que variáveis climáticas podem contribuir para a predição não apenas da abundância destes dípteros, mas também do seu grau de infecção natural.

          Translated abstract

          In Brazil, control of the vector Lutzomyia longipalpis is one of the main strategies used to limit the expansion of American visceral leishmaniasis. However, studies on the ecology of this sand fly are rare, especially regarding its natural infection with species of Leishmania. A study of the natural infection of Lu. longipalpis by Leishmania sp. was carried out in the Bela Vista neighborhood in the city of Teresina, Piauí State, Brazil, an important area of American visceral leishmaniasis transmission. From February 2004 to January 2005, sand flies were captured with CDC light traps. Approximately 10 female sand flies in each capture were dissected and examined for the presence of evolutionary forms of Leishmania sp. Two sand fly species were identified: 1,832 were Lu. longipalpis and six Lu. whitmani. Twenty female sand flies (1.1%), all Lu. longipalpis, were infected with procyclic and nectomonad forms of Leishmania sp., found mostly in the hindgut. Higher proportions of infected sand flies were found four months after the rainy season, suggesting that environmental factors may predict not only vector abundance (as already known) but also their level of infection.

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            Manual de vigilância e controle da leishmaniose visceral

            MS Brasil (2006)
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              Molecular aspects of parasite-vector and vector-host interactions in leishmaniasis.

              Leishmania-sand fly interactions are reviewed in the context of the potential barriers to the complete development of the parasite that exist within the midgut environment of phlebotomine flies and the molecular adaptations that the parasite has evolved that permit the development of transmissible infections to proceed. Cell surface and secreted phosphoglycans protect the parasite from the proteolytic activities of the blood-fed midgut, mediate attachment to the gut wall in order to maintain infection during excretion of the bloodmeal, and contribute to the formation of a biological plug in the anterior gut that may promote transmission by bite. The importance of vector saliva in modulating the host response to transmitted parasites is also reviewed.
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                Author and article information

                Journal
                csp
                Cadernos de Saúde Pública
                Cad. Saúde Pública
                Escola Nacional de Saúde Pública Sergio Arouca, Fundação Oswaldo Cruz (Rio de Janeiro, RJ, Brazil )
                0102-311X
                1678-4464
                July 2007
                : 23
                : 7
                : 1715-1720
                Affiliations
                [02] Rio de Janeiro Rio de Janeiro orgnameUniversidade do Estado do Rio de Janeiro orgdiv1Instituto de Medicina Social Brazil
                [05] Teresina Piauí orgnameUniversidade Federal do Piauí orgdiv1Departamento de Medicina Comunitária Brasil
                [01] Teresina Piauí orgnameUniversidade Federal do Piauí orgdiv1Laboratório de Sanidade Animal Brasil
                [04] Teresina orgnameInstituto de Doenças Tropicais Natan Portella Brasil
                [03] Rio de Janeiro Rio de Janeiro orgnameUniversidade Federal do Rio de Janeiro orgdiv1Núcleo de Estudos de Saúde Coletiva Brazil
                Article
                S0102-311X2007000700024 S0102-311X(07)02300724
                10.1590/S0102-311X2007000700024
                f85ad3b9-2664-4a85-89a4-1f973555d58f

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 26 January 2006
                : 20 October 2006
                : 26 February 2007
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 13, Pages: 6
                Product

                SciELO Public Health

                Self URI: Texto completo somente em PDF (PT)
                Categories
                Nota

                Leishmaniasis,Psychodidae,Leishmaniose,Infection,Pschodidae,Infecção,Vector Control,Controle de Vetores

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