Sand fly behavior: much more than weak-flying

BACKGROUND Leishmaniases are diseases transmitted by some species of sand flies and are widely distributed throughout the tropical regions of the planet. Despite the low mobility of these vectors, the geographical distributions of some species are quite extensive, which hinders control and surveillance measures in endemic areas. OBJECTIVES The present study investigated the flying capacity of sand flies. METHODS Four Hoover Penido (HP)-type light traps were positioned in the centre of the Velhas' River, about 80 metres equidistant from each other. We also realised capture/release/recapture attempts to assess possible capacity of phlebotomine fly uninterrupted up to 150 metres. Captured sand flies from one side of the river were marked using fluorescent powder (Luminous Paint kit, Bioquip®) and released on the other side, approximately 150 m distant. Recapture attempts were made on river's bank up to 30 days post-release. FINDINGS Six sand flies of the species Nyssomyia neivai (n = 4), Ny. intermedia (n = 1) and Evandromyia lenti (n = 1) were captured in the centre of the river. There were no recaptures of the 1,450 marked-and-released sand flies. MAIN CONCLUSIONS The results obtained disagree with data found in the literature regarding the flight capacity of sand fly vectors of leishmaniasis.

Construção e aplicação de um índice de vulnerabilidade humana à mudança do clima para o contexto brasileiro: a experiência do estado do Espírito Santo / Construction and application of a human vulnerability index for climate change in the Brazilian context: the experience of the state of Espírito Santo, Brazil

Resumo A mudança do clima representa séria ameaça para a população humana, causando impactos em diferentes setores. Conhecer os fatores que elevam a vulnerabilidade do ser humano à mudança do clima permite identificar pontos críticos e direcionar ações imediatas para reduzi-la. Assim, este estudo desenvolveu e aplicou um índice de vulnerabilidade à mudança do clima para as microrregiões do Espírito Santo, abarcando os elementos fundamentais da vulnerabilidade - exposição, sensibilidade e capacidade adaptativa. Anomalias climáticas de precipitação e temperatura também foram usadas para estimar as alterações para o futuro. A construção dos indicadores se baseou na atribuição de notas indicativas de vulnerabilidade para cada grupo de municípios (clustering), com posterior média aritmética e padronização dos valores para gerar índices variando entre 0 e 1. Verificou-se que a microrregião Noroeste apresenta vulnerabilidade extremamente elevada, em virtude de características, sociodemográficas, econômicas e ambientais. Todo o estado poderá ser afetado por alterações do clima futuro, principalmente pelo aumento de temperaturas médias. O norte do estado poderá ter aumento no número de dias secos consecutivos. Espera-se que esses resultados contribuam para orientar ações de adaptação à mudança do clima e aumentar a resiliência do território a partir da identificação das vulnerabilidades existentes.

Abstract Climate change poses a serious threat to the human population, causing impacts in different sectors. Understanding the factors that may increase human's vulnerability to climate change allows to identify critical points and to direct immediate actions to reduce vulnerability. Thus, this study developed and applied an index of vulnerability to climate change for the microregions of the state of Espírito Santo, Brazil, encompassing the key elements of vulnerability - Exposure, Sensitivity and Adaptive Capacity. Climatic anomalies of precipitation and temperature were also used for estimate future climate changes. Construction of the indicators was based on the assignment of scores indicating levels of vulnerability for each group of municipalities (clustering); subsequent arithmetic mean and standardization of the values were applied to generate indices from 0 and 1. The Northwestern microregion presented high vulnerability due to its sociodemographic, economic and environmental characteristics. In addition, the entire state may be affected by changes in future climate, mainly by the increase of average temperatures. The Northern region may have a considerable increase in the number of consecutive dry days. These results are expected to contribute to guide actions of adaptation to the climate change and to increase the resilience of the territory from the identification of existing vulnerabilities.

Fatores de risco peridomiciliares e conhecimento sobre leishmaniose visceral da população de Formiga, Minas Gerais / Peridomiciliary risk factors and knowledge concerning visceral leishmaniasis in the population of formiga, Minas Gerais, Brazil

RESUMO: Introdução: As leishmanioses representam uma importante carga de doença nos países tropicais, apresentando índices significativos de morbimortalidade nos locais onde ocorrem, incluindo o Brasil. Nesse contexto, a participação popular nas ações profiláticas pode ser determinante para o êxito das estratégias de controle. Objetivo: Por isso, o presente estudo teve o objetivo de investigar o conhecimento da população sobre as leishmanioses e a ocorrência de fatores de risco peridomiciliares associados à população no município de Formiga, Minas Gerais. Métodos: Foi realizado um inquérito domiciliar com uma amostra de 427 indivíduos entre maio e julho de 2011. Resultados: Apenas 7,5% dos moradores mostraram conhecimento sobre as leishmanioses, sendo principalmente as mulheres (OR = 3,15; IC95% 1,30 - 7,65). A prevalência de riscos peridomiciliares foi de 95%. Associação estatisticamente significativa foi encontrada entre maior escolaridade e menos fatores de risco peridomiciliares (OR = 0,45; IC95% 0,28 - 0,72) e entre o local de residência e maior número desses fatores de risco (OR = 1,84; IC95% 1,19 - 2,85). Conclusão: Os resultados demonstram que há baixo nível de conhecimento sobre as leishmanioses por parte da população. Além disso, a maioria dos respondentes está sujeita a algum fator de risco peridomiciliar, fato que pode contribuir para a manutenção do ciclo da doença no município.

ABSTRACT: Introduction: Leishmaniasis represents an important burden of diseases in tropical countries, with significant levels of morbidity and mortality where they occur, including in Brazil. In this context, popular participation in prophylactic actions can be decisive for the success of the control strategies. Objective: For this reason, this study aimed at investigating the population's knowledge concerning leishmaniasis and the occurrence of peridomiciliary risk factors associated with the population of Formiga, Minas Gerais. Methods: A household questionnaire with a sample of 427 individuals was conducted between May and July 2011. Results: Only 7.5% of the residents presented knowledge regarding leishmaniasis, most of them being women (OR = 3.15; 95%CI 1.30 - 7.65). The prevalence of peridomiciliary risks was 95%. A statistically significant association was found between higher education levels and less peridomiciliary risk factors (OR = 0.45; 95%CI 0.28 - 0.72) and between the place of residence and a higher number of risk factors (OR = 0.84; 95%CI 1.19 - 2.85). Conclusion: The results demonstrate that the population has low levels of knowledge about leishmaniasis. Moreover, the majority of respondents are subject to some peridomiciliary risk factor, which may contribute to the maintenance of the disease cycle in the city.

Epidemiologic aspects of toxoplasmosis and evaluation of its seroprevalence in pregnant women / Aspectos epidemiológicos da toxoplasmose e avaliação de sua soroprevalência em gestantes

INTRODUCTION: The aim of the present study was to analyze the exposure to risk factors for toxoplasmosis disease and the level of knowledge in pregnant women who were treated by the Public Health Care System (SUS) from October 2007 to September 2008 in Divinópolis City, Brazil. METHODS: We analyzed 2,136 prenatal exams of pregnant women that were treated from October 2007 to September 2008. RESULTS: Out of the 2,136 pregnant women evaluated, 200 answered a quantitative questionnaire; 49.5% were seropositive for immunoglobulin (Ig) G and 3.6% for IgM. Comparative analysis of congenital toxoplasmosis cases were evaluated in 11 regions and showed an irregular distribution (p < 0.01). This difference was also observed among the pregnant women observed in each location. The results from the questionnaire show that 93% of the pregnant women had no knowledge about toxoplasmosis, and 24% presented with positive serology, but no clinical manifestation. Analysis for pregnant IgG-positive women and the presence of pets showed a statistically significant correlation (p < 0.05), suggesting that the transmission of this disease might occur in the domestic environment. CONCLUSIONS: We suggest the implementation of a triage program for pregnant women and health education to encourage their use of SUS services.

INTRODUÇÃO: O objetivo deste trabalho foi estudar os fatores de riscos da toxoplasmose e investigar o nível de conhecimento das gestantes atendidas pelo Sistema Único de Saúde (SUS), no município de Divinópolis, Brasil. MÉTODOS: Para isso, foram analisados os exames pré-natais de 2.136 gestantes durante o período de outubro de 2007 a setembro de 2008. RESULTADOS: Das 2.136 gestantes avaliadas, 200 foram entrevistadas; destas, 49,5% foram soropositivas para IgG e 3,6% para IgM. A análise comparativa dos casos de toxoplasmose congênita, entre as 11 regiões que compõem o município, demonstrou uma distribuição irregular da enfermidade entre as localidades (p<0,01). As respostas dos questionários demonstraram que 93% das gestantes conhecem quase nada sobre toxoplasmose sendo que 24% apresentaram sorologia positiva sem manifestações clínicas. A análise de correlação entre gestantes IgG positivas e presença de animais de estimação foi estatisticamente significativa (p<0,05), reforçando a possibilidade da transmissão da enfermidade ocorrer no ambiente doméstico. CONCLUSÕES: É sugerida a implementação de um programa de triagem das gestantes, Educação em Saúde, que amplie e estimule a utilização dos serviços prestados pelo SUS.

Epidemiology of visceral leishmaniasis through spatial analysis, in Belo Horizonte municipality, state of Minas Gerais, Brazil

The geographic information system approach has permitted integration between demographic, socio-economic and environmental data, providing correlation between information from several data banks. In the current work, occurrence of human and canine visceral leishmaniases and insect vectors (Lutzomyia longipalpis) as well as biogeographic information related to 9 areas that comprise the city of Belo Horizonte, Brazil, between April 2001 and March 2002 were correlated and georeferenced. By using this technique it was possible to define concentration loci of canine leishmaniasis in the following regions: East; Northeast; Northwest; West; and Venda Nova. However, as for human leishmaniasis, it was not possible to perform the same analysis. Data analysis has also shown that 84.2 percent of the human leishmaniasis cases were related with canine leishmaniasis cases. Concerning biogeographic (altitude, area of vegetation influence, hydrographic, and areas of poverty) analysis, only altitude showed to influence emergence of leishmaniasis cases. A number of 4673 canine leishmaniasis cases and 64 human leishmaniasis cases were georeferenced, of which 67.5 and 71.9 percent, respectively, were living between 780 and 880 m above the sea level. At these same altitudes, a large number of phlebotomine sand flies were collected. Therefore, we suggest control measures for leishmaniasis in the city of Belo Horizonte, giving priority to canine leishmaniasis foci and regions at altitudes between 780 and 880 m.

Variations of the external male genitalia in three populations of Triatoma infestans Klug, 1834

Triatoma infestans is the triatomine that presents the greatest dispersion area in South America. However, it is not known whether the original characteristics of this insect remained in its long dispersion process. The purpose of this work was to study comparatively the external male genitalia of insects from diferent populations of T. infestans, two from Brazil (Minas Gerais and Bahia) and one from Bolivia (Cochabamba Valley), and to investigate the correlation between the morphological and behavioral variations. Differences were observed in one of the structures of the external genitalia (endosoma process) that could be used to characterize the insects from the three populations studied.