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Title: Community-based entomological surveillance reveals urban foci of Chagas disease vectors in Sobral, state of Ceará, northeastern Brazil
Authors: Parente, Cynara Carvalho
Bezerra, Fernando Schemelzer de Moraes
Parente, Plutarco
Dias-Neto, Raimundo
Xavier, Samanta Cristina das Chagas
Júnior, Alberto Novaes Ramos
Carvalho-Costa, Filipe Anibal
Lima, Marli Maria
Affilliation: Universidade Federal do Ceará. Faculdade de Medicina. Sobral, CE, Brasil.
Universidade Federal do Ceará. Faculdade de Farmácia, Odontologia e Enfermagem. Fortaleza, CE, Brasil.
Universidade Federal do Ceará. Faculdade de Medicina. Sobral, CE, Brasil.
Secretaria Municipal de Saúde de Sobral; Centro de Controle de Zoonoses. Sobral, CE, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia de Tripanossomaídeos, Rio de Janeiro, RJ, Brasil.
Universidade Federal do Ceará. Faculdade de Medicina. Fortaleza, CE, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Epidemiologia e Sistemática Molecular. Rio de Janeiro, RJ, Brasil / Fundação Oswaldo Cruz. Escritório Técnico Regional Piauí. Teresina, PI, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Ecoepidemiologia da Doença de Chagas. Rio de Janeiro, RJ, Brasil.
Abstract: Background The aim of this work was to explore the potential risk of vector-borne Chagas disease in urban districts in northeastern Brazil, by analyzing the spatiotemporal distributions and natural infection rates with Trypanosoma cruzi of triatomine species captured in recent years. The main motivation of this work was an acute human case of Chagas disease reported in 2008 in the municipality of Sobral. Methodology/principal findings We analyzed data from community-based entomological surveillance carried out from 2010 to 2014. Triatomine natural T. cruzi infection was assessed by examination of insect feces by optical microscopy. Sites of triatomine capture were georeferenced through Google Earth and analyzed with ArcGIS. A total of 191 triatomines were collected, consisting of 82.2% Triatoma pseudomaculata, 7.9% Rhodnius nasutus, 5.8% T. brasiliensis, 3.7% Panstrongylus lutzi, and 0.5% P. megistus, with an overall natural infection index of 17.8%. Most infestations were reported in the districts of Dom Jose´ (36.2%), Padre Palhano (24.7%), and Alto do Cristo (10.6%). The overwhelming majority of insects (185/96.9%) were captured inside houses, and most insects tended to be collected in intermittent peaks. Moreover, captured triatomines tended to constitute colonies. The acute case reported in 2008 was found to be situated within a T. pseudomaculata hotspot. Conclusion The triatomine collection events carried out by dwellers were aggregated in time and space into distinct foci, suggesting that insects are intermittently and artificially introduced into the city, possibly via accidental migration from their natural reservoirs. The relatively high T. cruzi infection rate indicates considerable circulation of the parasite in these areas, increasing the risk of vector-borne Chagas disease infection. These data suggest a need to strengthen epidemiological surveillance and integrate appropriate control actions targeting triatomines, T. cruzi reservoirs, and human populations. Our data also identify Chagas disease transmission as a hazard in urban areas of Sobral.
Keywords: Chagas Disease
keywords: Doença de Chagas
DeCS: Doença de Chagas
Issue Date: 2017
Citation: PARENTE, Cynara Carvalho Parente et. al. Community-Based Entomological Surveillance Reveals Urban Foci of Chagas Disease Vectors in Sobral, State of Ceara´, Northeastern Brazil. PlosOne, San Francisco, CA, v. 12, n. 1, p. 1-11, 2017.
DOI: 10.1371/journal.pone.0170278
ISSN: 1932-6203
Copyright: open access
Appears in Collections:IOC - Artigos de Periódicos
PI - Artigos de Periódicos

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