Rodent-borne viruses survey in rural settlers from Central Brazil

Anthropogenic environmental changes arising from settlement and agriculture include deforestation and replacement of natural vegetation by crops providing opportunities for pathogen spillover from animals to humans. This study aimed to investigate the prevalence of rodent-borne virus infections in seven rural settlements from Midwestern Brazil. Of the 466 individuals tested 12 (2.57%) were reactive for orthohantavirus and 3 (0.64%) for mammarenavirus. These rural settlers lived under unfavorable infrastructure, socioeconomic disadvantages, and unsanitary conditions, representing a risk for rodent-borne infections. Development of public policies towards the improvement of health, sanitation and awareness of rodent-borne diseases in improvised camps and settlements is imperative, in order to reduce morbidity and mortality caused by these diseases.

Conocimientos y prácticas asociadas a transmisión de triquinelosis, hanta y equinococosis quística / Knowledge and practices associated with transmission of trichinellosis, hanta and cystic equinococcosis

RESUMEN Objetivo: Asociar el nivel de conocimiento y prácticas (hábitos y costumbres) responsables de la transmisión de Triquinelosis, Síndrome Cardiopulmonar por Hantavirus y Equinococosis quística (Hidatidosis), en habitantes de los sectores rurales. Material y método: Estudio descriptivo correlacional de corte transversal en el que se aplicó una encuesta a 149 habitantes residentes en el área rural de las localidades de Curacautín, Lonquimay y Melipeuco, a través de muestreo no probabilístico por conveniencia, durante los meses de diciembre 2013 a enero 2014. Resultados: La población posee mejores conocimientos de Triquinelosis y Hanta que Hidatidosis, 64,9, 72,8 y 39,3%, respectivamente; los hábitos y costumbres para Hanta e Hidatidosis alcanzan mejores prácticas (84% cada una) que para Triquinelosis (69,5%); la población reconoce correctamente reservorio, fuente de infección y mecanismos de transmisión en Triquinelosis y Hanta, pero en menor grado Hidatidosis; respecto de los hábitos y costumbres, aun desconociendo los fundamentos teóricos, reportan buenas prácticas, aunque mantienen algunas que favorecen la transmisión de infecciones predominantemente en Triquinelosis. Conclusión: El nivel de conocimiento no asegura buenas prácticas, además los conocimientos y prácticas siguen un patrón empírico más que cognitivo, respaldados por aspectos culturales y del entorno. Esto sugiere mayor participación de los equipos interdisciplinarios en comunidades aisladas para fortalecer la promoción, educación y refuerzo de las buenas prácticas de acuerdo con sus condiciones sociales e incentivar la adherencia a conductas que reduzcan el riesgo de la transmisión de zoonosis.

ABSTRACT Objective: To associate the level of knowledge and practices (habits and customs) responsible for the transmission of trichinellosis, Hanta and cystic echinococcosis (hydatidosis), among rural population. Material and method: Cross-sectional correlational descriptive study in which 149 residents of the rural areas of Curacautín, Lonquimay and Melipeuco were surveyed, using non-probability convenience sampling from December 2013 to January 2014. Results: The population has better knowledge of trichinellosis and Hanta than hydatidosis, 64.9%, 72.8 and 39.3% respectively; they also have better practices regarding Hanta and hydatidosis (84% each) than regarding trichinellosis (69.5%). The population recognizes correctly the reservoir, source of infection and transmission mechanisms of trichinellosis and Hanta, and to a lesser degree hydatidosis; they report good practices regarding habits and customs, even ignoring theoretical foundations, but maintain some practices that favor the transmission of infections related to trichinellosis. Conclusion: The level of knowledge does not ensure good practices. Additionally, knowledge and practices follow an empirical rather than cognitive pattern, rooted on cultural and environmental aspects. This suggests greater participation of interdisciplinary teams in isolated communities to strengthen the promotion, education and reinforcement of good practices in accordance with their social conditions and to encourage adherence to behaviors that reduce the risk of the transmission of zoonoses.

Aspectos climáticos em áreas de transmissão de hantavirose no Estado de São Paulo, Brasil / Climatic aspects in hantavirus transmission areas in São Paulo State, Brazil

O objetivo deste trabalho foi investigar a distribuição espacial dos casos notificados de hantavirose (n = 80) no Estado de São Paulo, Brasil, de 1993 a 2005, e identificar os padrões climáticos locais nos anos de registro da doença. Foi utilizado o estimador de densidade de pontos de kernel que apontou maior concentração nas regiões de Ribeirão Preto, São Carlos, Franca, Tupi Paulista e Grande São Paulo. O aumento do número de casos no período sugere disseminação da doença, embora se considere o aumento da capacidade diagnóstica e maior sensibilidade do sistema de saúde. Registrou-se marcada sazonalidade da hantavirose nas áreas de cerrado, com padrão comum, isto é, maior incidência em meses com baixa pluviosidade, comparados com médias dos últimos quarenta anos. Esses períodos coincidem com épocas de maior disponibilidade de alimentos a roedores em cultura de grãos, cana e outros. A colheita e armazenamento desses grãos aumentam a exposição de populações humanas aos roedores. Indicadores climáticos em conjunto com variáveis ecológicas podem compor marcadores de risco de transmissão local a serem valorizados nas ações de vigilância epidemiológica e controle da doença.

The objective of this study was to investigate the spatial distribution of reported hantavirus cases in São Paulo State, Brazil (n = 80), from 1993 to 2005 and identify local climatic patterns during this period. Kernel point estimation of density was used to show the highest concentrations in Ribeirão Preto, São Carlos, Franca, Tupi Paulista, and Greater São Paulo. Increase in the number of cases during this period suggests disease dissemination even when considering increased diagnostic capacity and higher sensitivity of the health services. There was a marked seasonal variation in hantavirus in the cerrado (savannah) areas; the common pattern is a higher incidence in drier months as compared to mean levels in the last 40 years. These coincide with periods of high rodent food source levels in grains, sugarcane, and other crops. Harvesting and storing grains increases human exposure to rodents. Climatic indicators together with ecological variables can be local transmission risk markers and should receive more attention in epidemiological monitoring and control of the disease.