Entomological survey in the state of Piauí, Northeastern Brazil, reveals intradomiciliary colonization of Triatoma brasiliensis macromelasoma

This survey aimed to assess the presence of triatomine vectors of Chagas disease within the rural communities of São João do Piauí, Northeast Brazil. Intradomiciliary and peridomiciliary collection strategies were implemented wherein 279 specimens of Triatoma brasiliensis macromelasoma, both nymph and adult were found in 15 (50%) of the studied homes. Of the intradomiciliary insects, 73 (67.6%) were identified as nymph instars (1st instar [N1]= 6, N2= 14, N3= 28, N4= 7 and N5= 18). In the studied communities, a continuous interaction between triatomine bugs and humans could be shown. It is therefore urgent that suitable strategies for the control of the triatomine vector are implemented in this area

Aspectos Eco-Epidemiológicos e Áreas de Vulnerabilidade da doença de Chagas associadas a ações de Educação em Saúde na Região do Cariri, Estado do Ceará

Submitted by Gilvan Almeida ([email protected]) on 2017-05-17T14:39:50Z No. of bitstreams: 2 license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) 72975.pdf: 6004107 bytes, checksum: d022414cd2be2c3f8bba39ec48c05c48 (MD5)Approved for entry into archive by Anderson Silva ([email protected]) on 2017-06-08T19:09:13Z (GMT) No. of bitstreams: 2 72975.pdf: 6004107 bytes, checksum: d022414cd2be2c3f8bba39ec48c05c48 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5)Made available in DSpace on 2017-06-08T19:09:13Z (GMT). No. of bitstreams: 2 72975.pdf: 6004107 bytes, checksum: d022414cd2be2c3f8bba39ec48c05c48 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2016Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ, BrasilA doença de Chagas pertence ao grupo de doenças negligenciadas tratando-se de uma infecção crônica e potencialmente fatal causada pelo protozoário T. cruzi e transmitida por triatomíneos. O nordeste brasileiro é uma região onde esta doença ocorre endemicamente comportando diversas espécies de triatomíneos, permanecendo uma das regiões mais pobres do país, com habitações típicas para a proliferação do triatomíneo. Desta forma, o objetivo geral deste trabalho foi estudar a dinâmica de transmissão da doença na região do Cariri, sul do Ceará, abordando aspectos ambientais e sociais e cooperar tecnicamente com políticas institucionais para auxílio no controle da doença com ações de Educação em Saúde, atendendo as ações do Plano Brasil sem Miséria. Objetivos Específicos: Analisar dados entomológicos fornecidos pela 20ª CRES sobre a distribuição das espécies de triatomíneos dos municípios e os índices de infecção natural por tripanossomatídeos; coletar triatomíneos nos municípios de Farias Brito e Potengi e avaliar aspectos ecológicos das espécies coletadas; pesquisar a infecção natural por T. cruzi bem como de outros tripanossomatídeos e identificar as fontes de alimentação nos triatomíneos coletados; avaliar a soroprevalência para T. cruzi na população das localidades estudadas; realizar ações educativas para os moradores das localidades de coleta e para recursos humanos da área da saúde sobre o tema vetores da doença de Chagas; traçar possíveis relações entre aspectos sociais e ambientais na região, o nível de infestação por triatomíneos no peri e intradomicílios e o índice de infecção natural por T. cruzi Os resultados indicaram que não há correlação entre os aspectos sociais e ambientais e a infestação e infecção dos triatomíneos; a ocorrência de T. brasiliensis, T. pseudomaculata, P. lutzi, e R. nasutus na região e estas espécies foram encontradas infectadas por tripanossomatídeos semelhantes a T. cruzi; os ecótopos no peridomicilío mais favoráveis a presença de triatomíneos foram o galinheiro e amontoado de lenha sendo a estação de seca com a maior prevalência de triatomíneos. Entretanto, os resultados de soroprevalência indicaram a interrupção da transmissão vetorial de T. cruzi, não sendo encontrado nenhum morador com sorologia positiva. A população das localidades estudadas tinha conhecimento sobre o vetor adulto, porém, desconheciam formas imaturas e a maior parte da população disse que seus conhecimentos prévios sobre o vetor e a doença foram obtidos pelos dos agentes de endemiasChagas' disease belongs to the group of neglected diseases, being a chronic and potentially fatal infection caused by the protozoan T. cruzi and transmitted by triatomines. Northeastern Brazil is a region where this disease occurs endemically with several species of triatomines, remaining one of the poorest regions of the country, with habitations typical for the proliferation of triatomine. In this way, the general objective of this work was to study the transmission dynamics of the disease in the Cariri region, south of Ceará, addressing environmental and social aspects and to cooperate technically with institutional policies to aid in disease control with Health Education actions, the actions of the \201CPlano Brasil Sem Miséria\201D (BSM). Specific Objectives: To analyze entomological data provided by the 20th CRES on the distribution of the triatomine species of the municipalities and the indices of natural infection by trypanosomatids; To collect triatomines in the municipalities of Farias Brito and Potengi and to evaluate ecological aspects of the collected species; to investigate the natural infection by T. cruzi as well as of other trypanosomatids and to identify the feeding sources in the collected triatomines; to evaluate the seroprevalence for T. cruzi in the population of the studied localities; to carry out educational actions for the residents of the collection sites and for human resources of the health area on the theme vectors of Chagas' disease; to establish possible relationships between social and environmental aspects in the region, the level of infestation by triatomines in peri and intradomicilli, and the rate of natural infection by T. cruzi The results indicated that there is no correlation between social and environmental aspects and infestation and infection of triatomines; the occurrence of T. brasiliensis, T. pseudomaculata, P. lutzi, and R. nasutus in the region and these species were found infected by trypanosomatids similar to T. cruzi; the most favorable ecotypes in the peridomicile were triatomines were the chicken coop and heap And the dry season showed a higher prevalence of triatomines. However, the results of seroprevalence indicated the interruption of vector transmission of T. cruzi, and no resident with positive serology was found. The population of the localities studied had knowledge about the adult vector, but they did not know immature forms and most of the population said that their previous knowledge about the vector and the disease were obtained by the endemic agent

Triatomine dispersion rates and their association with socioeconomic and environmental conditions in Northeastern Brazil, from 2009 to 2013

Triatomines are vectors of Trypanosoma cruzi, the etiological agent of Chagas disease, which affects between 6 and 12 million people in Latin America, with an incidence rate of 12 thousand cases per year. In the Ceara State, the predominance of the caatinga biome, coupled with a large rural area with precarious human habitations, provides several s shelters for these insects. In this study, we determined the spatiotemporal distribution of triatomine dispersion rates in the Cariri region, Southern Ceara and ascertained the possible association between these rates with socioeconomic and environmental factors. Dispersion rates (number of positive localities/number of searched localities × 100) were analyzed regarding 13 municipalities from the Ceara State, from 2009 to 2013. Socioeconomic and environmental variables collected from national research institutes were associated with the dispersion rates and their local empirical Bayesian estimates. All the municipalities recorded dispersion rates over 10% in all years, and 11 municipalities had average rates over 40% for the period of study. Significant differences were observed among the municipality means. The highest rates were observed in Antonina do Norte and Potengi. According to the correlation analysis, the proportion between the occupied population and the total population showed a significant negative correlation, as well as the percentage of the population who lives under adequate sanitary conditions. Both, the percentage of revenues from external sources and the percentage of urban households in reforested blocks had a significant positive correlation. Our results show that socioeconomic and environmental variables can be factors that contribute to both, the maintenance and the reduction of the elevated dispersion rates observed in the study area. Similar researches that encompass more municipalities from that region may reinforce Chagas disease surveillance and control in the Northeast of Brazil

Triatomine dispersion rates and their association with socioeconomic and environmental conditions in Northeastern Brazil, from 2009 to 2013

ABSTRACT Triatomines are vectors of Trypanosoma cruzi , the etiological agent of Chagas disease, which affects between 6 and 12 million people in Latin America, with an incidence rate of 12 thousand cases per year. In the Ceara State, the predominance of the caatinga biome, coupled with a large rural area with precarious human habitations, provides several s shelters for these insects. In this study, we determined the spatiotemporal distribution of triatomine dispersion rates in the Cariri region, Southern Ceara and ascertained the possible association between these rates with socioeconomic and environmental factors. Dispersion rates (number of positive localities/number of searched localities × 100) were analyzed regarding 13 municipalities from the Ceara State, from 2009 to 2013. Socioeconomic and environmental variables collected from national research institutes were associated with the dispersion rates and their local empirical Bayesian estimates. All the municipalities recorded dispersion rates over 10% in all years, and 11 municipalities had average rates over 40% for the period of study. Significant differences were observed among the municipality means. The highest rates were observed in Antonina do Norte and Potengi. According to the correlation analysis, the proportion between the occupied population and the total population showed a significant negative correlation, as well as the percentage of the population who lives under adequate sanitary conditions. Both, the percentage of revenues from external sources and the percentage of urban households in reforested blocks had a significant positive correlation. Our results show that socioeconomic and environmental variables can be factors that contribute to both, the maintenance and the reduction of the elevated dispersion rates observed in the study area. Similar researches that encompass more municipalities from that region may reinforce Chagas disease surveillance and control in the Northeast of Brazil

Entomological survey in the state of Piauí, Northeastern Brazil, reveals intradomiciliary colonization of Triatoma brasiliensis macromelasoma

Submitted by Sandra Infurna ([email protected]) on 2017-11-09T15:02:03Z No. of bitstreams: 1 daniele_sousa_etal_IOC_2017.pdf: 874134 bytes, checksum: e806f00eccb413f26484f32daafbec3a (MD5)Approved for entry into archive by Sandra Infurna ([email protected]) on 2017-11-09T15:09:20Z (GMT) No. of bitstreams: 1 daniele_sousa_etal_IOC_2017.pdf: 874134 bytes, checksum: e806f00eccb413f26484f32daafbec3a (MD5)Made available in DSpace on 2017-11-09T15:09:20Z (GMT). No. of bitstreams: 1 daniele_sousa_etal_IOC_2017.pdf: 874134 bytes, checksum: e806f00eccb413f26484f32daafbec3a (MD5) Previous issue date: 2017Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório Interdisciplinar de Vigilância Entomológica em Diptera e Hemiptera. Rio de Janeiro, RJ, Brasil / Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Epidemiologia e Sistemática Molecular. Rio de Janeiro, RJ. Brasil.Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório Interdisciplinar de Vigilância Entomológica em Diptera e Hemiptera. Rio de Janeiro, RJ, 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 Epidemiologia e Sistemática Molecular. Rio de Janeiro, RJ. Brasil.Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório Interdisciplinar de Vigilância Entomológica em Diptera e Hemiptera. Rio de Janeiro, RJ, Brasil.Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório Interdisciplinar de Vigilância Entomológica em Diptera e Hemiptera. Rio de Janeiro, RJ, 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.This survey aimed to assess the presence of triatomine vectors of Chagas disease within the rural communities of São João do Piauí, Northeast Brazil. Intradomiciliary and peridomiciliary collection strategies were implemented wherein 279 specimens of Triatoma brasiliensis macromelasoma, both nymph and adult were found in 15 (50%) of the studied homes. Of the intradomiciliary insects, 73 (67.6%) were identified as nymph instars (1st instar [N1]= 6, N2= 14, N3= 28, N4= 7 and N5= 18). In the studied communities, a continuous interaction between triatomine bugs and humans could be shown. It is therefore urgent that suitable strategies for the control of the triatomine vector are implemented in this area

Entomological survey in the state of Piauí, Northeastern Brazil, reveals intradomiciliary colonization of Triatoma brasiliensis macromelasoma

ABSTRACT This survey aimed to assess the presence of triatomine vectors of Chagas disease within the rural communities of São João do Piauí, Northeast Brazil. Intradomiciliary and peridomiciliary collection strategies were implemented wherein 279 specimens of Triatoma brasiliensis macromelasoma, both nymph and adult were found in 15 (50%) of the studied homes. Of the intradomiciliary insects, 73 (67.6%) were identified as nymph instars (1st instar [N1]= 6, N2= 14, N3= 28, N4= 7 and N5= 18). In the studied communities, a continuous interaction between triatomine bugs and humans could be shown. It is therefore urgent that suitable strategies for the control of the triatomine vector are implemented in this area