Seroprevalence of Chagas disease in rural communities at Campinas do Piauí city, Brazil.

OBJECTIVES: This manuscript aimed to evaluate the seroprevalence of Chagas's disease in the population of rural communities at Campinas do Piauí city, State of Piauí, Brazil. METHODS: The techniques of the indirect immunofluorescence reaction and enzyme-linked immunosorbent assay were used to detect reagent samples for Chagas disease and estimate its prevalence in the rural population. Blood samples were collected on filter paper through digital and venipuncture. Blood samples with reactive or indeterminate results were re-evaluated and subjected to the test by ELISA. RESULTS: In total, 763 blood samples were analysed from 161 residences of 18 rural communities, collected in residents aged between 2 and 92 years. In the indirect immunofluorescence reaction technique, 44 (5.8%) of the results were positive, being 40 (5.2%) confirmed by the enzyme-linked immunosorbent assay. Among the communities surveyed, we observed reactive cases in 15 of them, these cases being distributed, according to the age group, as follows: 1 case from 0 to 10 years; 13 cases from 11 to 60 years old; and 30 cases over 61 years. CONCLUSION: The results indicate that Chagas's disease remains with active transmission in the Campinas do Piaui city according to the occurrence of a case in a resident under 10 years of age. The region is endemic for Chagas's disease, as observed by the high prevalence of positive cases.

OBJECTIFS: Ce manuscrit visait à évaluer la séroprévalence de la maladie de Chagas dans la population des communautés rurales de la ville de Campinas do Piauí, état de Piauí, au Brésil. MÉTHODES: Les techniques de la réaction d'immunofluorescence indirecte et ELISA ont été utilisées pour détecter des échantillons réagissant pour la maladie de Chagas et estimer sa prévalence dans la population rurale. Des échantillons de sang ont été collectés sur papier filtre par ponction digitale et veineuse. Les échantillons de sang avec des résultats positifs ou indéterminés ont été réévalués et soumis au test ELISA. RÉSULTATS: Au total, 763 échantillons de sang ont été analysés dans 161 résidences de 18 communautés rurales, prélevés chez des résidents âgés de 2 à 92 ans. Dans la technique de la réaction d'immunofluorescence indirecte, 44 (5,8%) des résultats étaient positifs, dont 40 (5,2%) confirmés par le test ELISA. Parmi les communautés enquêtées, nous avons observé des cas réactifs dans 15 d'entre eux, ces cas se répartissant, selon la tranche d'âge, comme suit: 1 cas chez les 0 à 10 ans, 13 cas chez les 11 à 60 ans, 30 cas chez des plus de 61 ans. CONCLUSION: Les résultats indiquent que la maladie de Chagas maintient une transmission active dans la ville de Campinas do Piauí avec la survenue d'un cas chez un résident de moins de 10 ans. La région est endémique pour la maladie de Chagas, comme en témoigne la forte prévalence des cas positifs.

Triatoma brasiliensis Neiva, 1911 and Triatoma pseudomaculata Corrêa and Espínola, 1964 (Hemiptera, Reduviidae, Triatominae) in rural communities in Northeast Brazil.

Chagas disease is an important endemic morbidity in Latin America affecting millions of people in the American continent. It is caused by the protozoan Trypanosoma cruzi, and transmitted through the feces of the insect vector belonging to the subfamily Triatominae. The present conducted an entomological survey of triatomines and analyzed entomological indicators, such as the rate of infestation, colonization, triatomine density and natural infection in rural communities in the municipality of Campinas do Piaui, Piaui State, in the Northeast region of Brazil. Data on the search of triatomines performed in 167 domiciliary units (DUs), harvested during the period of February to July 2019, in 12 rural communities were analyzed. The capture of triatomines occurred in all studied communities, being 76 the number of positive DUs, of the 167 surveyed, presenting a global rate of infestation of 45.51%. Two triatomines species were collected: Triatoma brasiliensis (98.49%) and T. pseudomaculata (1.51%), the first was found in the domiciliary and peridomiciliary areas, while the second was captured only in peridomiciliary areas. The index of colonization was 17.1%. Natural infection was observed only in 5.44% of T. brasiliensis samples. The entomological survey was conducted in rural communities, showingthe risk of transmission of Chagas disease to the local population, requiring continuous entomological surveillance and vector control.