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Rafael AF, Ferreira RA, Mota AF, Damasceno RF, Menezes ASDS, Lopes BT, de Paulo GL, Sabino EC, Ribeiro ALP, Quintino ND, Vieira TM. Overview of Chagas disease surveillance in an endemic region in Southeastern Brazil. Rev Inst Med Trop Sao Paulo 2023; 65:e51. [PMID: 37820247 PMCID: PMC10564458 DOI: 10.1590/s1678-9946202365051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Accepted: 07/13/2023] [Indexed: 10/13/2023] Open
Abstract
Chagas disease (CD) is a neglected disease caused by the protozoan Trypanosoma cruzi. It has high morbidity and mortality rates and mainly affects socially vulnerable populations. This is a cross-sectional study, with retrospective and prospective data collection. Using questionnaires applied to environmental surveillance coordinators, we characterized the status of CD surveillance activities in municipalities endemic for the disease in Northern Minas Gerais State (MG) and Jequitinhonha Valley (Vale do Jequitinhonha). Moreover, we spatialized the vulnerability index for chronic CD in the study area. The population consisted of 22 environmental surveillance coordinators, active in 2020, from Northern MG and Jequitinhonha Valley, 21 municipalities included in the SaMi-Trop research project, and Montes Claros municipality. After applying the questionnaires to the coordinators, a descriptive analysis of the variables was performed. To characterize the active municipalities, the explanatory variables collected in the questionnaire were compared with the dichotomous variable. Bivariate descriptive analysis was performed. Finally, geoprocessing techniques were used to spatialize the data and prepare maps. Regarding the team of endemic combat agents (ECA), 90.9% reported the lack of a specific team for CD vector control actions. Of the 22 municipalities participating in this study, nine were active (41.1%). Only 25% (n=2) of active municipalities (9% of the municipalities studied) met the target of visiting 50% of households per year. Finally, 81.1% of the coordinators stated that in their municipality, they developed actions linked to primary health care (PHC). The implementation of CD surveillance activities weakened in the endemic region. Few municipalities have a surveillance team, with low regularity of active surveillance and noncompliance with the program's goal. The results suggest insufficient recording of activities in the information system, considering that there are municipalities that report performing the activities, but no production record was observed in the system.
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Affiliation(s)
- Aline Ferreira Rafael
- Universidade Estadual de Montes Claros, Programa de Pós-Graduação em Ciências da Saúde, Montes Claros, Minas Gerais, Brazil
| | - Raquel Aparecida Ferreira
- Fundação Oswaldo Cruz, Instituto René Rachou, Grupo de Pesquisa Triatomíneos, Belo Horizonte, Minas Gerais, Brazil
| | - Ariela Ferreira Mota
- Universidade Estadual de Montes Claros, Programa de Pós-Graduação em Ciências da Saúde, Montes Claros, Minas Gerais, Brazil
| | - Renata Fiúza Damasceno
- Universidade Estadual de Montes Claros, Programa de Pós-Graduação em Ciências da Saúde, Montes Claros, Minas Gerais, Brazil
| | | | | | - Gustavo Libério de Paulo
- Universidade Federal de Minas Gerais, Instituto de Geociências, Programa de Pós-Graduação em Análise e Modelagem de Sistemas Ambientais, Belo Horizonte, Minas Gerais, Brazil
| | - Ester Cerdeira Sabino
- Universidade de São Paulo, Faculdade de Medicina, Instituto de Medicina Tropical de São Paulo, São Paulo, São Paulo, Brazil
| | - Antônio Luiz Pinho Ribeiro
- Universidade Federal de Minas Gerais, Faculdade de Medicina, Hospital das Clínicas Belo Horizonte, Minas Gerais, Brazil
| | | | - Thallyta Maria Vieira
- Universidade Estadual de Montes Claros, Programa de Pós-Graduação em Ciências da Saúde, Montes Claros, Minas Gerais, Brazil
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Mello FD, Souza GD, Bedin C, Duarte MB, Leon ÍFD, Villela MM. Occurrence and distribution of Panstrongylus megistus (Burmeister, 1835) (Hemiptera, Reduviidae) in a metropolitan area of Southern Brazil. Rev Inst Med Trop Sao Paulo 2023; 65:e35. [PMID: 37283410 DOI: 10.1590/s1678-9946202365035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 03/28/2023] [Indexed: 06/08/2023] Open
Abstract
Two triatomine genera (Panstrongylus and Triatoma) have essentially been recorded in Rio Grande do Sul State, Brazil. Panstrongylus megistus should be highlighted since this species is one of the main vectors of Trypanosoma cruzi in Brazil, due to its wide geographical distribution and the high susceptibility to this protozoan. This study aimed to present not only the occurrence and distribution of P. megistus in the Porto Alegre city's metropolitan area (PAMA), Rio Grande do Sul State, Brazil, but also the rates of T. cruzi infection, from 2009 to 2020. The PAMA, which comprises 34 cities and 4.4 million habitants, extends across the transition area in two biomes - Pampa and Mata Atlantica - found in the state. Results showed that P. megistus was recorded in 76.5% of cities (i.e., 26 out of 34), mainly in Porto Alegre city, where the vector was found in 11 out of the 12 years that were monitored. Three hundred and nineteen specimens were captured. Two hundred and sixty-seven specimens (83.7%) were located intradomicile (p < 0.0001), while 52.3% positivity for T. cruzi was found. Thus, P. megistus is important in the PAMA, because it invades and colonizes the households. Moreover, the high rates of T. cruzi infection have drawn attention.
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Affiliation(s)
- Fernanda de Mello
- Secretaria Estadual da Saúde, Centro Estadual de Vigilância em Saúde, Laboratório Central de Saúde Pública, Porto Alegre, Rio Grande do Sul, Brazil
| | - Getúlio Dornelles Souza
- Prefeitura de Porto Alegre, Secretaria Municipal de Saúde, Diretoria de Vigilância em Saúde, Porto Alegre, Rio Grande do Sul, Brazil
| | - Cleonara Bedin
- Secretaria Estadual da Saúde, Centro Estadual de Vigilância em Saúde, Laboratório Central de Saúde Pública, Porto Alegre, Rio Grande do Sul, Brazil
| | - Marcelo Bergamin Duarte
- Secretaria Estadual da Saúde, Centro Estadual de Vigilância em Saúde, Laboratório Central de Saúde Pública, Porto Alegre, Rio Grande do Sul, Brazil
| | - Ítalo Ferreira de Leon
- Universidade Federal de Pelotas, Programa de Pós-Graduação Stricto Sensu em Microbiologia e Parasitologia, Pelotas, Rio Grande do Sul, Brazil
| | - Marcos Marreiro Villela
- Universidade Federal de Pelotas, Departamento de Microbiologia e Parasitologia, Laboratório de Parasitologia Humana, Pelotas, Rio Grande do Sul, Brazil
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Rezende MDAR, Lana MD, Diotaiuti L, Machado-de-Assis GF. Entomological surveillance of Chagas disease in the East of Minas Gerais region, Brazil. Rev Soc Bras Med Trop 2022; 55:e0065. [PMID: 36134858 DOI: 10.1590/0037-8682-0065-2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Accepted: 06/01/2022] [Indexed: 11/21/2022] Open
Abstract
BACKGROUND After decentralizing the actions of the Chagas Disease Control Program (CDCP) in Brazil, municipalities were now responsible for control measures against this endemic, supervised by the Regional Health Superintendencies (RHS). We aimed to evaluate the recent entomological surveillance of Chagas disease in the Regional Health Superintendence of Governador Valadares (RHS/GV) from 2014 to 2019. METHODS Triatomines captured by residents during entomological surveillance were sent to the reference laboratory, where the species and evolutionary stages were identified, place of capture, and presence of Trypanosoma cruzi. A database was created, and the following were calculated: the rate of infection by T. cruzi (overall rate and rate by species), monthly seasonality, spatial distribution of species, number of captures, and infected triatomines/health microregions. RESULTS We identified 1,708 insects; 1,506 (88.2%) were triatomines, most were adult instars (n=1,469), and few were nymphs (n=37). The identified species were Triatoma vitticeps, Panstrongylus megistus, Panstrongylus diasi, Rhodnius neglectus, and Panstrongylus geniculatus. The first three were most frequently captured and distributed throughout the study area. Most bugs were captured intradomicile (72.5%), mainly in the second semester, between September and November, with an average infection rate of 41.5% (predominantly T. vitticeps, 49.2%). All municipalities sent triatomines, especially in the microregions of Governador Valadares. CONCLUSIONS These data reinforce the need and importance of improving Chagas disease control measures in the region to establish active and participatory entomological surveillance.
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Affiliation(s)
- Mariana de Almeida Rosa Rezende
- Universidade Federal de Juiz de Fora, Campus Governador Valadares, Programa de Pós-Graduação em Ciências Aplicadas à Saúde, Governador Valadares, MG, Brasil
| | - Marta de Lana
- Universidade Federal de Ouro Preto, Programa de Pós-Graduação em Ciências Biológicas e Programa de Pós-Graduação em Ciências Farmacêuticas, Ouro Preto, MG, Brasil
| | - Liléia Diotaiuti
- Centro de Pesquisas René Rachou, Laboratório de Triatomíneos e Epidemiologia da Doença de Chagas, Belo Horizonte, MG, Brasil
| | - Girley Francisco Machado-de-Assis
- Universidade Federal de Juiz de Fora, Campus Governador Valadares, Programa de Pós-Graduação em Ciências Aplicadas à Saúde, Laboratório de Parasitologia, Governador Valadares, MG, Brasil
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Campos MCOA, Gonçalves TDS, Ursine RL, Marinho SDSB, Rodríguez Moreno A, Diotaiuti LG, Damasceno RF, Ferreira AM, Ribeiro ALP, Sabino EC, Vieira TM. Occurrence and spatial distribution of triatomines (Hemiptera: Reduviidae) in the urban area of the municipality of Montes Claros, Northern Minas Gerais, Brazil. Zoonoses Public Health 2022; 69:83-94. [PMID: 34825495 PMCID: PMC10787537 DOI: 10.1111/zph.12897] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 08/23/2021] [Accepted: 09/28/2021] [Indexed: 11/30/2022]
Abstract
The north of the Brazilian state of Minas Gerais is classified as an area of high risk of vectorial transmission of Chagas disease (CD) or of reestablishing transmission in the home, but the Chagas disease control programme is disjointed. The study evaluated the occurrence, natural infection and the spatial distribution of species of triatomines associated with climatic variations in the urban area of Montes Claros, a municipality endemic to CD in the north of Minas Gerais, Brazil. Triatomine data were obtained from passive entomological surveillance actions of the Chagas Disease Control Program (Programa de Controle de Doença de Chagas-PCDCh), registered by the Zoonosis Control Center (Centro de Controle de Zoonoses-CCZ) from 2009 to 2019. A total of 277 triatomines belonging to eight species were collected, and of these, 203 insects were examined. It was found that 46.2% of triatomines were captured inside the home and 8.3% around the home. The natural infection rate was 6.9%; 14 specimens showed natural infection by Trypanosoma cruzi (12 females and 2 males), and of these, 13 were found in the home and one in an uninformed location. The number of triatomine records collected was significantly higher in the month of September (p = .01), and there was an inverse correlation between the number of triatomines and the relative humidity of the air (p < .001). It was verified that the highest triatomine densities are located in transition areas between urban infrastructure (32.12%) and pasture (25.72%). The diversity of species of triatomines infected with T. cruzi in residential units in urban areas in the municipality of Montes Claros is worrying, as it suggests a potential risk of transmission of the parasite to domestic animals and humans.
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Affiliation(s)
| | | | - Renata Luiz Ursine
- Health Science Programme, State University of Montes Claros, Montes Claros, Brazil
| | | | | | | | | | - Ariela Mota Ferreira
- Health Science Programme, State University of Montes Claros, Montes Claros, Brazil
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Martins MF, de Moraes SC, Oliveira J, dos Santos JC, Santos-Silva LK, Galvão C. Triatoma williami in intradomiciliary environments of urban areas in Mato Grosso State, Brazil: domiciliation process of a wild species? Infect Dis Poverty 2022; 11:18. [PMID: 35164858 PMCID: PMC8843021 DOI: 10.1186/s40249-022-00938-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Accepted: 01/18/2022] [Indexed: 01/09/2023] Open
Abstract
Abstract
Background
Triatomines in Latin America are natural Chagas disease (ChD) vectors. Triatomine domiciliation is one of the main factors increasing the occurrence risk of this disease in humans. There are 66 triatomine species in Brazil, with three genera of significant epidemiological importance—Panstrongylus, Rhodnius, and Triatoma. Among the Triatoma species, Triatoma williami, a wild species, has been reported in Goiás, Mato Grosso, and Mato Grosso do Sul. In the Barra do Garças, Mato Grosso, the invasion by triatomines has been reported, with T. williami being the most common species. This study aimed to survey triatomine fauna and determine the Trypanosoma cruzi natural infection rates in triatomines in the urban area of Barra do Garças, Mato Grosso, Brazil.
Methods
Triatomine specimens were sampled by passive surveillance or active search by agents combating endemic diseases from 2019 to 2020. A parasitological feces diagnosis was performed to detect the presence of T. cruzi after the specimens were identified. Concerning T. cruzi identification, molecular diagnosis and genetic sequencing were performed to determine the strain, also called discrete typing units (DTUs).
Results
The 211 triatomines were collected, distributed in specimens of T. williami (84.4%), P. geniculatus (3.3%), P. diasi (1.4%), and R. neglectus (10.9%). Two colonies of T. williami were found through morphological analyses. These insects were sampled inside domiciles in an urban area neighboring Jardim Pitaluga (15° 51′57.7″ N, 052° 16′ 04.5 E). The records were sampled in September 2019 and January 2021. The rate of natural infection by T. cruzi was 39.4%. Two T. williami specimens from the sampled colonies were positive for the T. cruzi strain DTU IV.
Conclusions
This is the first time that T. williami has been confirmed in an urban area of Barra do Garças, Mato Grosso, Brazil. Further studies are needed for a clearer understanding of the ecology of this species for prevention and control mechanisms since its sampled specimens had a high rate of natural infection by T. cruzi.
Graphical Abstract
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Euzébio DM, dos Santos FR, da Cruz DMEDQ, Varjão AEL, Costa IS, Manhães GLV, Nascimento EM, Correia D, da Silva AM. Trypanosoma cruzi vectors and reservoirs in Southern Sergipe. Rev Soc Bras Med Trop 2021; 54:e0740. [PMID: 33886818 PMCID: PMC8047701 DOI: 10.1590/0037-8682-0740-2020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 03/16/2021] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION Chagas disease is a health problem that affects approximately 7 million people worldwide, according to the World Health Organization. Vector transmission is one of the most important routes in South and Central American countries. Between 2013 and 2019, municipalities of Sergipe sent 507 triatomines for analysis, unveiling the largest records found in the south in the villages of Poço da Clara, Alagoinhas and Pilões, and the municipality of Tobias Barreto. The high prevalence of infected vectors in these localities motivated this epidemiological study. METHODS After educational lectures on the vectors and risks of the disease, a structured questionnaire was administered to identify areas and risk factors for transmission of the parasite. The data guided the collection of vectors and blood samples from domestic reservoirs. RESULTS The studied region is considered endemic for triatomines infected by Trypanosoma cruzi with three species of vectors; the highest prevalence was Panstrongylus lutzi (54.83%), followed by Triatoma pseudomaculata (43.54%), and Triatoma tibiamaculata (1.61%). In the villages in this study, 100% of the vectors were found intradomically. The coexistence of residents with domestic animals was reported by 62.04% (255) of those surveyed. Forty-one small animals that were actively living with humans at home in the localities were evaluated serologically. No infection was observed in the domestic animals. CONCLUSIONS There are favorable conditions for the domiciliation of triatomines in the evaluated locations, contributing to the risk of vectorial transmission of Chagas disease.
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Affiliation(s)
- Diana Matos Euzébio
- Universidade Federal de Sergipe, Programa de Pós-graduação Stricto Sensu em Ciências da Saúde, Aracaju, SE, Brasil
- Universidade Federal de Sergipe, Hospital Universitário, Aracaju, SE, Brasil
| | - Fábia Regina dos Santos
- Universidade Federal de Sergipe, Programa de Pós-graduação Stricto Sensu em Ciências da Saúde, Aracaju, SE, Brasil
- Universidade Federal de Sergipe, Hospital Universitário, Aracaju, SE, Brasil
| | | | | | | | | | | | - Dalmo Correia
- Universidade Federal do Triângulo Mineiro, Programa de Graduação em Medicina, Uberaba, MG, Brasil
| | - Angela Maria da Silva
- Universidade Federal de Sergipe, Programa de Pós-graduação Stricto Sensu em Ciências da Saúde, Aracaju, SE, Brasil
- Universidade Federal de Sergipe, Departamento de Medicina, Aracaju, SE, Brasil
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Dias JVL, Souza RDCMD, Souza JMB, Diotaiuti LG, Ferreira RA. Occurrence of Panstrongylus megistus (Burmeister, 1835) in an area under entomological surveillance in the Southeast Region of Brazil. Rev Soc Bras Med Trop 2021; 54:e00842020. [PMID: 33338105 PMCID: PMC7747831 DOI: 10.1590/0037-8682-0084-2020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 07/13/2020] [Indexed: 11/21/2022] Open
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Dario MA, Andrade TES, Dos Santos CB, Fux B, Brandão AA, Falqueto A. Molecular characterization of Trypanosoma cruzi samples derived from Triatoma vitticeps and Panstrongylus geniculatus of the Atlantic rainforest, southeast Brazil. ACTA ACUST UNITED AC 2018; 25:59. [PMID: 30474600 PMCID: PMC6254102 DOI: 10.1051/parasite/2018060] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2018] [Accepted: 11/06/2018] [Indexed: 01/04/2023]
Abstract
Background: In rural areas of Espírito Santo state, southeast Brazil, triatomine species attracted by light frequently invade residences. The aim of this study was to investigate the Trypanosoma cruzi discrete typing units (DTUs) harbored by these triatomines. Methods: Triatomine’s intestinal contents were examined, inoculated in mice, and the positive samples were cultivated. Flagellates obtained from infected mice hemoculture were submitted to DNA extraction using a salting-out method and to TcSC5D gene amplification. The amplified samples were sequenced, and polymorphism was analyzed for DTU identification. Results: Three hundred and ninety-four triatomines were identified: Triatoma vitticeps (90.03%), Panstrongylus geniculatus (8.89%), Panstrongylus megistus (0.54%), Panstrongylus diasi (0.27%), and Triatoma tibiamaculata (0.27%). Among the specimens, 251/394 (67.65%) presented flagellated forms similar to T. cruzi. After triatomine intestinal content inoculation into mice, 134 mice presented T. cruzi-like trypomastigotes from Tr. vitticeps and P. geniculatus and 89 samples were positive in hemoculture. Sixty-two samples were analyzed for the TcSC5D gene and TcI, TcII, TcIII, and TcIV DTUs were identified. Conclusions: We observed T. cruzi DTU diversity in Tr. vitticeps and P. geniculatus, which showed the predominance of TcII and occurrence of TcI, TcIII and TcIV. Triatomines presented high T. cruzi infection rates. Since little is known regarding the possible mammalian hosts that maintain the T. cruzi cycle, further studies are necessary to obtain a better understanding of the parasite transmission cycle in this region.
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Affiliation(s)
- Maria Augusta Dario
- Unidade de Medicina Tropical, Universidade Federal do Espírito Santo (UFES), Av. Marechal Campos, 1468, Vitória, ES 29043-900, Brazil
| | | | - Claudiney Biral Dos Santos
- Núcleo de Entomologia e Malacologia, Secretaria de estado da Saúde (SESA/ES), Rua Pedro Zangradini, 320, Serra, ES 29164-020, Brazil
| | - Blima Fux
- Unidade de Medicina Tropical, Universidade Federal do Espírito Santo (UFES), Av. Marechal Campos, 1468, Vitória, ES 29043-900, Brazil
| | - Adeilton Alves Brandão
- Laboratório Interdisciplinar em Pesquisas Médicas, Instituto Oswaldo Cruz/Fiocruz, Av. Brasil, 4365, Rio de Janeiro, RJ 21040-900, Brazil
| | - Aloísio Falqueto
- Unidade de Medicina Tropical, Universidade Federal do Espírito Santo (UFES), Av. Marechal Campos, 1468, Vitória, ES 29043-900, Brazil
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Melo CM, Cruz ACFG, Lima AFVA, Silva LR, Madi RR, Jeraldo VDLS, Mercado R. Triatomine Fauna and Recent Epidemiological Dynamics of Chagas Disease in an Endemic Area of Northeast Brazil. THE CANADIAN JOURNAL OF INFECTIOUS DISEASES & MEDICAL MICROBIOLOGY = JOURNAL CANADIEN DES MALADIES INFECTIEUSES ET DE LA MICROBIOLOGIE MEDICALE 2018; 2018:7020541. [PMID: 30364104 PMCID: PMC6188735 DOI: 10.1155/2018/7020541] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 07/01/2018] [Accepted: 08/15/2018] [Indexed: 11/18/2022]
Abstract
Updated information of the dispersion dynamics of Chagas disease (CD) and a systemic analysis of these data will aid the early identification of areas that are vulnerable to transmission and enable efficient intervention. This work synthesized spatiotemporal information regarding triatomine fauna and analyzed this information in combination with the results from serological tests to elucidate the epidemiological panorama of CD in the state of Sergipe, Brazil. This is a retrospective analytical study that utilized information from the database of the National Chagas Disease Control Program. Between 2010 and 2016, 838 triatomines of eight species, namely, Panstrongylus geniculatus, which was first recorded in the state of Sergipe, Panstrongylus lutzi, P. megistus, Triatoma brasiliensis, T. pseudomaculata, T. tibiamaculata, T. melanocephala, and Rhodnius neglectus, were collected. Optical microscopy revealed that 13.2% of triatomines examined were infected by Trypanosoma cruzi-like flagellates. The distribution of triatomines exhibits an expanding south-central to northern dispersion, with a preference for semiarid and agreste areas and occasional observations in humid coastal areas due to anthropogenic actions reflected in the environment. Of the human cases analyzed from 2012 to 2016, 8.3% (191/2316) presented positive serology for Trypanosoma cruzi, and this proportion showed a gradual increase in the southern center of the state and new notifications in coastal regions. There is a need for intensification and continuity of the measures adopted by the Chagas Disease Control Program in Sergipe, identifying new priority areas for intervention and preferential ecotopes of the vectors, considering the occurrence of positive triatomines intradomicilliary and a source of new triatomines in the peridomiciles.
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Affiliation(s)
- Cláudia M. Melo
- Universidade Tiradentes, Programa de Pós-Graduação em Saúde e Ambiente, Laboratório de Doenças Infecciosas e Parasitárias (LDIP/ITP), Aracaju, Brazil
| | - Ana Carla F. G. Cruz
- Universidade Tiradentes, Programa de Pós-Graduação em Saúde e Ambiente, Laboratório de Doenças Infecciosas e Parasitárias (LDIP/ITP), Aracaju, Brazil
| | - Antônio Fernando V. A. Lima
- Secretaria de Estado da Saúde de Sergipe, Laboratório Central de Saúde Pública de Sergipe (Lacen-SE), Laboratório de Entomologia, Aracaju, Brazil
| | - Luan R. Silva
- Universidade Tiradentes, Laboratório de Doenças Infecciosas e Parasitárias (LDIP/ITP), Aracaju, Brazil
| | - Rubens R. Madi
- Universidade Tiradentes, Programa de Pós-Graduação em Saúde e Ambiente, Laboratório de Doenças Infecciosas e Parasitárias (LDIP/ITP), Aracaju, Brazil
| | - Veronica de Lourdes S. Jeraldo
- Universidade Tiradentes, Programa de Pós-Graduação em Saúde e Ambiente, Laboratório de Doenças Infecciosas e Parasitárias (LDIP/ITP), Aracaju, Brazil
| | - Ruben Mercado
- Universidad de Chile, Facultad de Medicina, Santiago, Chile
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Santos CVD, Bedin C, Wilhelms TS, Villela MM. Assessment of the Housing Improvement Program for Chagas Disease Control in the Northwestern municipalities of Rio Grande do Sul, Brazil. Rev Soc Bras Med Trop 2016; 49:572-578. [PMID: 27812651 DOI: 10.1590/0037-8682-0386-2016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 09/13/2016] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION: The Housing Improvement Program for Chagas Disease Control (HIPCDC) was established in 2001 in Northwestern Rio Grande do Sul State, aiming to improve the conditions of the domiciliary and peridomiciliary environments to make them resistant to triatomine colonization. This study aimed to assess the impact of the HIPCDC on triatomine control by developing local population and authority awareness on the issue. METHODS: The study was conducted by means of questionnaires applied to local authorities and the program beneficiaries. Three municipalities - Ajuricaba, Coronel Barros, and Crissiumal - were visited. RESULTS: A program coordinator from each municipality and 62 individuals from selected households were interviewed. The authorities reported difficulties in the implementation of the program due to differences between the project development period and financial resource availability, in addition to a lack of understanding by the community not included in the program. As for the houses, most improvements were made in the peridomiciliary environments; moreover, construction of 4 new residences, as well as the renovation of others, was also reported. Regarding suggestions to the program, requests for better planning (44.9%) and renovation quality (36.7%) were highlighted. With reference to the presence of triatomine bugs, prior to the HIPCDC adaptations, 12.9% of the respondents reported coming across at least one specimen at home, as compared to 22.6% who found these insects in peridomiciliary areas. CONCLUSIONS: Despite reports of difficulties in carrying out the HIPCDC, there was an improvement in the housing conditions, with no triatomine occurrence reports after the program implementation.
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Affiliation(s)
- Cibele Velleda Dos Santos
- Programa de Pós-Graduação Stricto Sensu em Parasitologia, Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, Brazil.,Laboratório de Parasitologia Humana, Departamento de Microbiologia e Parasitologia, Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, Brazil
| | - Clenonara Bedin
- Divisão de Vigilância Ambiental em Saúde, Núcleo de Vigilância dos Riscos e Agravos Ambientais Biológicos, Secretaria Estadual da Saúde do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Tania Stasiak Wilhelms
- Divisão de Vigilância Ambiental em Saúde, Núcleo de Vigilância dos Riscos e Agravos Ambientais Biológicos, Secretaria Estadual da Saúde do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Marcos Marreiro Villela
- Laboratório de Parasitologia Humana, Departamento de Microbiologia e Parasitologia, Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, Brazil
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11
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Bello Corassa R, Aceijas C, Alves PAB, Garelick H. Evolution of Chagas' disease in Brazil. Epidemiological perspective and challenges for the future: a critical review. Perspect Public Health 2016; 137:289-295. [PMID: 27758973 DOI: 10.1177/1757913916671160] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
AIMS This article aimed to provide a critical review of the evolution of Chagas' disease (ChD) in Brazil, its magnitude, historical development and management, and challenges for the future. METHODS A literature search was performed using PubMed, SciELO and Google Scholar and throughout collected articles' references. Narrative analysis was structured around five main themes identified: vector transmission, control programme, transfusion, oral and congenital transmission. RESULTS In Brazil, the Chagas' Disease Control Programme was fully implemented in the 1980s, when it reached practically all the endemic areas, and in 1991, the Southern Cone Initiative was created, aiming to control the disease transmission through eliminating the Triatoma infestans and controlling blood banks. As a result, the prevalence of chagasic donors in blood banks reduced from 4.4% in the 1980s to 0.2% in 2005. In 2006, Pan American Health Organization (PAHO) certified the interruption of transmission of ChD through this vector in Brazil. However, there are still challenges, such as the domiciliation of new vector species, the need for medical care of the infected individuals, the prevention of alternative mechanisms of transmission, the loss of political concern regarding the disease and the weakening of the control programme. CONCLUSION Despite the progress towards control, there are still many challenges ahead to maintain and expand such control and minimise the risk of re-emergence.
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Affiliation(s)
- Rafael Bello Corassa
- Federal University of Jequitinhonha and Mucuri Valleys, Campus JK, Diamantina, MG, Brazil
| | - Carmen Aceijas
- Middlesex University, The Burroughs Hendon, Town Hall Extension Building, London NW4 4BT. UK
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Campos CF, Cangussú SD, Duz ALC, Cartelle CT, Noviello MDL, Veloso VM, Bahia MT, Almeida-Leite CM, Arantes RME. Enteric Neuronal Damage, Intramuscular Denervation and Smooth Muscle Phenotype Changes as Mechanisms of Chagasic Megacolon: Evidence from a Long-Term Murine Model of Trypanosoma cruzi Infection. PLoS One 2016; 11:e0153038. [PMID: 27045678 PMCID: PMC4821538 DOI: 10.1371/journal.pone.0153038] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 03/06/2016] [Indexed: 01/25/2023] Open
Abstract
We developed a novel murine model of long-term infection with Trypanosoma cruzi with the aim to elucidate the pathogenesis of megacolon and the associated adaptive and neuromuscular intestinal disorders. Our intent was to produce a chronic stage of the disease since the early treatment should avoid 100% mortality of untreated animals at acute phase. Treatment allowed animals to be kept infected and alive in order to develop the chronic phase of infection with low parasitism as in human disease. A group of Swiss mice was infected with the Y strain of T. cruzi. At the 11th day after infection, a sub-group was euthanized (acute-phase group) and another sub-group was treated with benznidazole and euthanized 15 months after infection (chronic-phase group). Whole colon samples were harvested and used for studying the histopathology of the intestinal smooth muscle and the plasticity of the enteric nerves. In the acute phase, all animals presented inflammatory lesions associated with intense and diffuse parasitism of the muscular and submucosa layers, which were enlarged when compared with the controls. The occurrence of intense degenerative inflammatory changes and increased reticular fibers suggests inflammatory-induced necrosis of muscle cells. In the chronic phase, parasitism was insignificant; however, the architecture of Aüerbach plexuses was focally affected in the inflamed areas, and a significant decrease in the number of neurons and in the density of intramuscular nerve bundles was detected. Other changes observed included increased thickness of the colon wall, diffuse muscle cell hypertrophy, and increased collagen deposition, indicating early fibrosis in the damaged areas. Mast cell count significantly increased in the muscular layers. We propose a model for studying the long-term (15 months) pathogenesis of Chagasic megacolon in mice that mimics the human disease, which persists for several years and has not been fully elucidated. We hypothesize that the long-term inflammatory process mediates neuronal damage and intramuscular and intramural denervation, leading to phenotypic changes in smooth muscle cells associated with fibrosis. These long-term structural changes may represent the basic mechanism for the formation of the Chagasic megacolon.
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Affiliation(s)
- Camila França Campos
- Departamento de Patologia Geral Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Silvia Dantas Cangussú
- Departamento de Ciências Biológicas/LAFEX, Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, Brazil
| | - Ana Luiza Cassin Duz
- Departamento de Patologia Geral Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Christiane Teixeira Cartelle
- Departamento de Patologia Geral Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Maria de Lourdes Noviello
- Departamento de Patologia Geral Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Vanja Maria Veloso
- Departamento de Ciências Biológicas/NUPEB, Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, Brazil
| | - Maria Terezinha Bahia
- Departamento de Ciências Biológicas/NUPEB, Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, Brazil
| | - Camila Megale Almeida-Leite
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Rosa Maria Esteves Arantes
- Departamento de Patologia Geral Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
- * E-mail:
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Rossi JCN, Duarte EC, Gurgel-Gonçalves R. Factors associated with the occurrence of Triatoma sordida (Hemiptera: Reduviidae) in rural localities of Central-West Brazil. Mem Inst Oswaldo Cruz 2015; 110:192-200. [PMID: 25946242 PMCID: PMC4489449 DOI: 10.1590/0074-02760140395] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 12/19/2014] [Indexed: 11/21/2022] Open
Abstract
This study estimates the factors of artificial environments (houses and peridomestic areas) associated with Triatoma sordida occurrence. Manual searches for triatomines were performed in 136 domiciliary units (DUs) in two rural localities of Central-West Brazil. For each DU, 32 structural, 23 biotic and 28 management variables were obtained. Multiple logistic regression analysis was performed in order to identify statistically significant variables associated with occurrence of T. sordida in the study areas. A total of 1,057 specimens (99% in peridomiciles, mainly chicken coops) of T. sordida were collected from 63 DUs (infestation: 47%; density: ~8 specimens/DU; crowding: ~17 specimens/infested DU; colonisation: 81%). Only six (0.6%) out of 945 specimens examined were infected with Trypanosoma cruzi. The final adjusted logistic regression model indicated that the probability of T. sordida occurrence was higher in DU with wooden chicken coops, presence of > 30 animals in wooden corrals, presence of wood piles and presence of food storeroom. The results show the persistence of T. sordida in peridomestic habitats in rural localities of Central-West Brazil. However, the observed low intradomestic colonisation and minimal triatomine infection rates indicate that T. sordida has low potential to sustain high rates of T. cruzi transmission to residents of these localities.
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Vinhaes MC, de Oliveira SV, Reis PO, de Lacerda Sousa AC, Silva RAE, Obara MT, Bezerra CM, da Costa VM, Alves RV, Gurgel-Gonçalves R. Assessing the vulnerability of Brazilian municipalities to the vectorial transmission of Trypanosoma cruzi using multi-criteria decision analysis. Acta Trop 2014; 137:105-10. [PMID: 24857942 DOI: 10.1016/j.actatropica.2014.05.007] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2013] [Revised: 05/11/2014] [Accepted: 05/14/2014] [Indexed: 11/24/2022]
Abstract
Despite the dramatic reduction in Trypanosoma cruzi vectorial transmission in Brazil, acute cases of Chagas disease (CD) continue to be recorded. The identification of areas with greater vulnerability to the occurrence of vector-borne CD is essential to prevention, control, and surveillance activities. In the current study, data on the occurrence of domiciliated triatomines in Brazil (non-Amazonian regions) between 2007 and 2011 were analyzed. Municipalities' vulnerability was assessed based on socioeconomic, demographic, entomological, and environmental indicators using multi-criteria decision analysis (MCDA). Overall, 2275 municipalities were positive for at least one of the six triatomine species analyzed (Panstrongylus megistus, Triatoma infestans, Triatoma brasiliensis, Triatoma pseudomaculata, Triatoma rubrovaria, and Triatoma sordida). The municipalities that were most vulnerable to vector-borne CD were mainly in the northeast region and exhibited a higher occurrence of domiciliated triatomines, lower socioeconomic levels, and more extensive anthropized areas. Most of the 39 new vector-borne CD cases confirmed between 2001 and 2012 in non-Amazonian regions occurred within the more vulnerable municipalities. Thus, MCDA can help to identify the states and municipalities that are most vulnerable to the transmission of T. cruzi by domiciliated triatomines, which is critical for directing adequate surveillance, prevention, and control activities. The methodological approach and results presented here can be used to enhance CD surveillance in Brazil.
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Pereira JM, Almeida PSD, Sousa AVD, Paula AMD, Machado RB, Gurgel-Gonçalves R. Climatic factors influencing triatomine occurrence in Central-West Brazil. Mem Inst Oswaldo Cruz 2014; 108:S0074-02762013000300335. [PMID: 23778666 DOI: 10.1590/s0074-02762013000300012] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Accepted: 09/18/2012] [Indexed: 11/22/2022] Open
Abstract
We estimated the geographic distributions of triatomine species in Central-West Region of Brazil (CW) and analysed the climatic factors influencing their occurrence. A total of 3,396 records of 27 triatomine species were analysed. Using the maximum entropy method, ecological niche models were produced for eight species occurring in at least 20 municipalities based on 13 climatic variables and elevation. Triatoma sordida and Rhodnius neglectus were the species with the broadest geographic distributions in CW Brazil. The Cerrado areas in the state of Goiás were found to be more suitable for the occurrence of synanthropic triatomines than the Amazon forest areas in the northern part of the state of Mato Grosso. The variable that best explains the evaluated models is temperature seasonality. The results indicate that almost the entire region presents climatic conditions that are appropriate for at least one triatomine species. Therefore, it is recommended that entomological surveillance be reinforced in CW Brazil.
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Affiliation(s)
- Joyce Mendes Pereira
- Ministério da Saúde, Secretaria de Vigilância em Saúde, Coordenação Geral de Laboratórios de Saúde Pública, DF, Brasília, Brasil
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Belisario CJ, Dias JVL, Diotaiuti L. Profile of the Trypanosoma cruzi vector infestation in Jaboticatubas, State of Minas Gerais, Brazil. Rev Soc Bras Med Trop 2013; 46:779-82. [DOI: 10.1590/0037-8682-1712-2013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Accepted: 03/27/2013] [Indexed: 11/21/2022] Open
Affiliation(s)
| | - Joao Victor Leite Dias
- Fundacao Oswaldo Cruz, BRAZIL; Universidade Federal dos Vales do Jequitinhonha e Mucuri, Brasil
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Pissetti CW, de Oliveira RF, Correia D, Nascentes GAN, Llaguno MM, Rodrigues V. Association between the lymphotoxin-alpha gene polymorphism and chagasic cardiopathy. J Interferon Cytokine Res 2013; 33:130-5. [PMID: 23289732 DOI: 10.1089/jir.2012.0024] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Lymphotoxin-alpha (LT-alpha or LTA) is an inflammatory cytokine that is involved in the organization and maintenance of the inflammatory process and in the arrangement of cells at the site of inflammation. These features suggest an important role in the development of chronic Chagas' disease, especially the cardiac form. The objective of this study was to evaluate LT-alpha genetics and its biological role in chronic Chagas' disease. A total of 284 subjects were studied. The LT-alpha single-nucleotide polymorphism (+252) was analyzed by the polymerase chain reaction-restriction fragment length polymorphism and expression by enzyme-linked immunosorbent assay in culture supernatants and in individual T lymphocytes by flow cytometry. The risk of developing the cardiac form was 2.8 times higher among carriers of genotype GG and 2.4 times among carriers of genotype GA when compared to subjects carrying genotype AA. Seropositive subjects carrying the G allele produced significantly higher levels of LT-alpha. The cytokine was mainly expressed by CD8(+) T lymphocytes in the absence of any stimulus and after stimulation with the Trypanosoma cruzi antigen. This study provides genetic and biological evidence for an important role of LT-alpha in the development of the cardiac form of Chagas' disease.
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Affiliation(s)
- Cristina Wide Pissetti
- Laboratory of Immunology, Universidade Federal do Triângulo Mineiro, Uberaba, Minas Gerais, Brazil.
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Maeda MH, Knox MB, Gurgel-Gonçalves R. Occurrence of synanthropic triatomines (Hemiptera: Reduviidae) in the Federal District of Brazil. Rev Soc Bras Med Trop 2012; 45:71-6. [PMID: 22370832 DOI: 10.1590/s0037-86822012000100014] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2011] [Accepted: 08/05/2011] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION Entomological surveillance of Chagas disease in the Federal District of Brazil (DF), has recorded the following triatomine species: Panstrongylus megistus, P. geniculatus, P. diasi, Rhodnius neglectus, Triatoma pseudomaculata, and T. sordida. We aimed to analyze the spatial and temporal occurrence of triatomine species collected in DF, and their indices of natural infection with trypanosomes. METHODS The Health State Secretariat of DF recorded triatomines between 2002 and 2010 in 20 administrative regions. This retrospective analysis considered the number of adults and nymphs of each species collected and infected in both intradomicile and peridomicile. RESULTS A total of 754 triatomines were collected in 252 reported domiciles. Panstrongylus megistus was the most frequent species (65%), followed by T. pseudomaculata (14%). Of the 309 examined insects, only 3 (1%) specimens of P. megistus were infected with flagellates morphologically similar to Trypanosoma cruzi. The spatial occurrence indicated a higher diversity of triatomines and frequency of T. sordida in rural areas. Moreover, there was a predominance of P. megistus in urban areas. The number of records of P. megistus in the rainy season was two times higher than that during the dry season. The largest number of triatomines was collected in November. CONCLUSIONS The presence of P. megistus specimens infected with trypanosomes in domiciles, shows the potential risk of human infection in DF. Thus, it is essential to continue entomological surveillance, intensifying it in the rainy season and in regions of greater occurrence.
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Affiliation(s)
- Maicon Hitoshi Maeda
- Secretaria Estadual de Saúde, Diretoria de Vigilância Ambiental do Distrito Federal, Brasília, DF
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Gurgel-Gonçalves R, Galvão C, Costa J, Peterson AT. Geographic distribution of chagas disease vectors in Brazil based on ecological niche modeling. J Trop Med 2012; 2012:705326. [PMID: 22523500 PMCID: PMC3317230 DOI: 10.1155/2012/705326] [Citation(s) in RCA: 132] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2011] [Accepted: 10/23/2011] [Indexed: 11/17/2022] Open
Abstract
Although Brazil was declared free from Chagas disease transmission by the domestic vector Triatoma infestans, human acute cases are still being registered based on transmission by native triatomine species. For a better understanding of transmission risk, the geographic distribution of Brazilian triatomines was analyzed. Sixteen out of 62 Brazilian species that both occur in >20 municipalities and present synanthropic tendencies were modeled based on their ecological niches. Panstrongylus geniculatus and P. megistus showed broad ecological ranges, but most of the species sort out by the biome in which they are distributed: Rhodnius pictipes and R. robustus in the Amazon; R. neglectus, Triatoma sordida, and T. costalimai in the Cerrado; R. nasutus, P. lutzi, T. brasiliensis, T. pseudomaculata, T. melanocephala, and T. petrocchiae in the Caatinga; T. rubrovaria in the southern pampas; T. tibiamaculata and T. vitticeps in the Atlantic Forest. Although most occurrences were recorded in open areas (Cerrado and Caatinga), our results show that all environmental conditions in the country are favorable to one or more of the species analyzed, such that almost nowhere is Chagas transmission risk negligible.
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Affiliation(s)
- Rodrigo Gurgel-Gonçalves
- Laboratório de Parasitologia Médica e Biologia de Vetores, Área de Patologia, Faculdade de Medicina, Universidade de Brasília, Campus Universitário Darcy Ribeiro, 70904-970 Brasília, DF, Brazil
| | - Cléber Galvão
- Laboratório Nacional e Internacional de Referência em Taxonomia de Triatomíneos, Instituto Oswaldo Cruz, FIOCRUZ, 21045-900 Rio de Janeiro, RJ, Brazil
| | - Jane Costa
- Laboratório de Biodiversidade Entomológica, Instituto Oswaldo Cruz, FIOCRUZ, 21045-900 Rio de Janeiro, RJ, Brazil
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Abad-Franch F, Vega MC, Rolón MS, Santos WS, Rojas de Arias A. Community participation in Chagas disease vector surveillance: systematic review. PLoS Negl Trop Dis 2011; 5:e1207. [PMID: 21713022 PMCID: PMC3119642 DOI: 10.1371/journal.pntd.0001207] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2011] [Accepted: 05/01/2011] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Vector control has substantially reduced Chagas disease (ChD) incidence. However, transmission by household-reinfesting triatomines persists, suggesting that entomological surveillance should play a crucial role in the long-term interruption of transmission. Yet, infestation foci become smaller and harder to detect as vector control proceeds, and highly sensitive surveillance methods are needed. Community participation (CP) and vector-detection devices (VDDs) are both thought to enhance surveillance, but this remains to be thoroughly assessed. METHODOLOGY/PRINCIPAL FINDINGS We searched Medline, Web of Knowledge, Scopus, LILACS, SciELO, the bibliographies of retrieved studies, and our own records. Data from studies describing vector control and/or surveillance interventions were extracted by two reviewers. Outcomes of primary interest included changes in infestation rates and the detection of infestation/reinfestation foci. Most results likely depended on study- and site-specific conditions, precluding meta-analysis, but we re-analysed data from studies comparing vector control and detection methods whenever possible. Results confirm that professional, insecticide-based vector control is highly effective, but also show that reinfestation by native triatomines is common and widespread across Latin America. Bug notification by householders (the simplest CP-based strategy) significantly boosts vector detection probabilities; in comparison, both active searches and VDDs perform poorly, although they might in some cases complement each other. CONCLUSIONS/SIGNIFICANCE CP should become a strategic component of ChD surveillance, but only professional insecticide spraying seems consistently effective at eliminating infestation foci. Involvement of stakeholders at all process stages, from planning to evaluation, would probably enhance such CP-based strategies.
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Pissetti CW, Correia D, de Oliveira RF, Llaguno MM, Balarin MAS, Silva-Grecco RL, Rodrigues V. Genetic and functional role of TNF-alpha in the development Trypanosoma cruzi infection. PLoS Negl Trop Dis 2011; 5:e976. [PMID: 21408088 PMCID: PMC3050938 DOI: 10.1371/journal.pntd.0000976] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2010] [Accepted: 02/02/2011] [Indexed: 11/19/2022] Open
Abstract
TNF-alpha plays an important role in trypanocidal mechanisms and is related to tissue injury. This cytokine has been detected in the heart of human chagasic patients where it is associated with tissue damage. This study investigated whether TNF-alpha levels and the presence of genetic polymorphisms are associated with the presence of T. cruzi infection and/or with the development of the cardiac form in chronic chagasic patients. Genomic DNA of 300 subjects from an endemic area was extracted and analyzed by PCR using specific primers. TNF-alpha was assayed in culture supernatants by ELISA. An association was observed between the absence of the TNF-238A allele and negative serology. Furthermore, seropositive individuals carrying the TNF-238A allele produced significantly higher TNF-alpha levels without stimulation (p=0.04) and after stimulation with LPS (p=0.007) and T. cruzi antigens (p=0.004). The present results suggest that the polymorphism at position -238 influences susceptibility to infection and that this allele is associated with higher TNF-alpha production in seropositive individuals.
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Affiliation(s)
- Cristina Wide Pissetti
- Laboratory of Immunology, Universidade Federal do Triângulo Mineiro, Uberaba, Minas Gerais, Brazil
| | - Dalmo Correia
- Department of Internal Medicine, Universidade Federal do Triângulo Mineiro, Uberaba, Minas Gerais, Brazil
| | - Rafael Faria de Oliveira
- Laboratory of Immunology, Universidade Federal do Triângulo Mineiro, Uberaba, Minas Gerais, Brazil
| | - Maurício Manoel Llaguno
- Laboratory of Immunology, Universidade Federal do Triângulo Mineiro, Uberaba, Minas Gerais, Brazil
| | | | | | - Virmondes Rodrigues
- Laboratory of Immunology, Universidade Federal do Triângulo Mineiro, Uberaba, Minas Gerais, Brazil
- * E-mail:
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Villela MM, Rodrigues VLCC, Casanova C, Dias JCP. Análise da fonte alimentar de Panstrongylus megistus (Hemiptera, Reduviidae, Triatominae) e sua atual importância como vetor do Trypanosoma cruzi, no Estado de Minas Gerais. Rev Soc Bras Med Trop 2010; 43:125-8. [DOI: 10.1590/s0037-86822010000200004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2009] [Accepted: 12/01/2009] [Indexed: 05/26/2023] Open
Abstract
INTRODUÇÃO: A pesquisa da fonte alimentar dos triatomíneos auxilia no conhecimento sobre a biologia destes insetos, inclusive para inferir-se a importância dos mesmos como transmissores do Trypanosoma cruzi ao homem. MÉTODOS: O presente estudo objetivou registrar, através da reação de precipitina, a fonte alimentar de triatomíneos provenientes de 54 municípios da região centro-oeste de Minas Gerais, assim como a infecção natural destes para flagelados semelhantes ao Trypanosoma cruzi. RESULTADOS: De julho de 2003 até março de 2007, foram avaliados 416 insetos, todos da espécie Panstrongylus megistus. Somando-se as ocorrências, as aves (70%) e os humanos (22,5%) constituíram as principais fontes sanguíneas. Encontrou-se 16 (3,8%) insetos positivos para flagelados semelhantes ao Trypanosoma cruzi sendo que oito realizaram hematofagia no homem. CONCLUSÕES: Os resultados demonstram necessidade de acentuar a vigilância entomológica na região, visto que foi detectada a possibilidade de ocorrência de novos casos da doença de Chagas através da transmissão vetorial.
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Silva-Grecco RL, Balarin MAS, Correia D, Prata A, Rodrigues V. Familial analysis of seropositivity to Trypanosoma cruzi and of clinical forms of Chagas disease. Am J Trop Med Hyg 2010; 82:45-8. [PMID: 20064994 DOI: 10.4269/ajtmh.2010.08-0626] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
A cross-sectional study was carried out in Agua Comprida, MG, Brazil, a region previously endemic to Chagas disease whose vectorial transmission was interrupted around 20 year ago. A total of 998 individuals were examined for anti-Trypanosoma cruzi antibodies. Seropositivity was observed in 255 subjects (25.5%), and 743 subjects were negative. Forty-one families with 5-80 individuals with similar environmental conditions were selected for familial analysis. In 15 families, seropositivity to T. cruzi was observed in > 50% of individuals. The segregation analysis confirmed family aggregation for the seropositivity to the T. cruzi. Heart commitment was the major clinical form observed, and in six families, > 50% of the individuals display cardiopathy that may be attributed to T. cruzi infection. Our results support the hypothesis that there is a family aggregation for the seropositivity but without the effect of one major gene.
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Affiliation(s)
- Roseane L Silva-Grecco
- Disciplina de Genética, Federal University of the Triângulo Mineiro, Uberaba, Minas Gerais, Brazil.
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Ribeiro I, Sevcsik AM, Alves F, Diap G, Don R, Harhay MO, Chang S, Pecoul B. New, improved treatments for Chagas disease: from the R&D pipeline to the patients. PLoS Negl Trop Dis 2009; 3:e484. [PMID: 19582163 PMCID: PMC2702098 DOI: 10.1371/journal.pntd.0000484] [Citation(s) in RCA: 118] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Affiliation(s)
- Isabela Ribeiro
- Drugs for Neglected Diseases
initiative, Geneva, Switzerland
| | | | - Fabiana Alves
- Drugs for Neglected Diseases
initiative, Geneva, Switzerland
| | - Graciela Diap
- Drugs for Neglected Diseases
initiative, Geneva, Switzerland
| | - Robert Don
- Drugs for Neglected Diseases
initiative, Geneva, Switzerland
| | - Michael O. Harhay
- Masters of Public Health Program, University
of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of
America
| | - Shing Chang
- Drugs for Neglected Diseases
initiative, Geneva, Switzerland
| | - Bernard Pecoul
- Drugs for Neglected Diseases
initiative, Geneva, Switzerland
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