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Iniciativa México: Propuesta para el control y vigilancia epidemiológica de la enfermedad de Chagas en México
Salazar Schettino,Paz María; Cravioto Q,Alejandro; Tapia Conver,Roberto;
Boletín chileno de parasitología , 2001, DOI: 10.4067/S0365-94022001000200008
Abstract: it is showed the programme for the knowledge, control and epidemiological surveillance of chagas disease in mexico.
Opportunities for Improved Chagas Disease Vector Control Based on Knowledge, Attitudes and Practices of Communities in the Yucatan Peninsula, Mexico  [PDF]
Kathryn Rosecrans,Gabriela Cruz-Martin,Ashley King,Eric Dumonteil
PLOS Neglected Tropical Diseases , 2014, DOI: 10.1371/journal.pntd.0002763
Abstract: Background Chagas disease is a vector-borne parasitic disease of major public health importance. Current prevention efforts are based on triatomine vector control to reduce transmission to humans. Success of vector control interventions depends on their acceptability and value to affected communities. We aimed to identify opportunities for and barriers to improved vector control strategies in the Yucatan peninsula, Mexico. Methodology/principal findings We employed a sequence of qualitative and quantitative research methods to investigate knowledge, attitudes and practices surrounding Chagas disease, triatomines and vector control in three rural communities. Our combined data show that community members are well aware of triatomines and are knowledgeable about their habits. However, most have a limited understanding of the transmission dynamics and clinical manifestations of Chagas disease. While triatomine control is not a priority for community members, they frequently use domestic insecticide products including insecticide spray, mosquito coils and plug-in repellents. Families spend about $32 US per year on these products. Alternative methods such as yard cleaning and window screens are perceived as desirable and potentially more effective. Screens are nonetheless described as unaffordable, in spite of a cost comparable to the average annual spending on insecticide products. Conclusion/Significance Further education campaigns and possibly financing schemes may lead families to redirect their current vector control spending from insecticide products to window screens. Also, synergism with mosquito control efforts should be further explored to motivate community involvement and ensure sustainability of Chagas disease vector control.
Optimization of Control Strategies for Non-Domiciliated Triatoma dimidiata, Chagas Disease Vector in the Yucatán Peninsula, Mexico  [PDF]
Corentin Barbu,Eric Dumonteil,Sébastien Gourbière
PLOS Neglected Tropical Diseases , 2009, DOI: 10.1371/journal.pntd.0000416
Abstract: Background Chagas disease is the most important vector-borne disease in Latin America. Regional initiatives based on residual insecticide spraying have successfully controlled domiciliated vectors in many regions. Non-domiciliated vectors remain responsible for a significant transmission risk, and their control is now a key challenge for disease control. Methodology/Principal Findings A mathematical model was developed to predict the temporal variations in abundance of non-domiciliated vectors inside houses. Demographic parameters were estimated by fitting the model to two years of field data from the Yucatan peninsula, Mexico. The predictive value of the model was tested on an independent data set before simulations examined the efficacy of control strategies based on residual insecticide spraying, insect screens, and bednets. The model accurately fitted and predicted field data in the absence and presence of insecticide spraying. Pyrethroid spraying was found effective when 50 mg/m2 were applied yearly within a two-month period matching the immigration season. The >80% reduction in bug abundance was not improved by larger doses or more frequent interventions, and it decreased drastically for different timing and lower frequencies of intervention. Alternatively, the use of insect screens consistently reduced bug abundance proportionally to the reduction of the vector immigration rate. Conclusion/Significance Control of non-domiciliated vectors can hardly be achieved by insecticide spraying, because it would require yearly application and an accurate understanding of the temporal pattern of immigration. Insect screens appear to offer an effective and sustainable alternative, which may be part of multi-disease interventions for the integrated control of neglected vector-borne diseases.
Update on Chagas' disease in Mexico
Dumonteil,Eric;
Salud Pública de México , 1999, DOI: 10.1590/S0036-36341999000400010
Abstract: chagas' disease, caused by the protozoan parasite trypanosoma cruzi, represents a major public health problem in most of the american continent. as transmission of the parasite is being interrupted in most of south america, the disease remains endemic in various areas of mexico. we review here some of the information gathered in recent years. seroprevalence of t. cruzi infection in humans remains relatively high in some areas, and there has been a general increase in the number of chronic cases reported to health authorities in recent years. in fact, chronic chagasic cardiomyopathy appears to be affecting a large number of patients with heart disease, but many cases may be misreported because of the unspecific nature of the clinical symptoms. epidemiological monitoring of vector and reservoir populations, as well as of human cases is helping focus on endemic areas, but a better coordination and development of these efforts is still needed. recent studies of parasite biology are in agreement with previous work showing the great diversity of parasite characteristics, and support the need for a regional approach to this zoonosis. strong and continuing support from health and academic authorities is thus still needed to further improve our understanding of chagas' disease in mexico and implement efficient control programs.
Update on Chagas' disease in Mexico  [cached]
Dumonteil Eric
Salud Pública de México , 1999,
Abstract: Chagas' disease, caused by the protozoan parasite Trypanosoma cruzi, represents a major public health problem in most of the American continent. As transmission of the parasite is being interrupted in most of South America, the disease remains endemic in various areas of Mexico. We review here some of the information gathered in recent years. Seroprevalence of T. cruzi infection in humans remains relatively high in some areas, and there has been a general increase in the number of chronic cases reported to health authorities in recent years. In fact, chronic chagasic cardiomyopathy appears to be affecting a large number of patients with heart disease, but many cases may be misreported because of the unspecific nature of the clinical symptoms. Epidemiological monitoring of vector and reservoir populations, as well as of human cases is helping focus on endemic areas, but a better coordination and development of these efforts is still needed. Recent studies of parasite biology are in agreement with previous work showing the great diversity of parasite characteristics, and support the need for a regional approach to this zoonosis. Strong and continuing support from health and academic authorities is thus still needed to further improve our understanding of Chagas' disease in Mexico and implement efficient control programs.
Controle da transmiss o transfusional da doen a de Chagas na Iniciativa do Cone Sul
Dias Jo?o Carlos Pinto,Schofield Christopher John
Revista da Sociedade Brasileira de Medicina Tropical , 1998,
Abstract: Integrando os objetivos principais da iniciativa dos 6 Países do Cone Sul para a elimina o da doen a de Chagas, a partir de 1991, foram intensificadas as a es de controle das atividades hemoterápicas, em paralelo com o combate intensivo ao Triatoma infestans, principal vetor da doen a da Regi o. Através das atividades específicas e também como produto direto do controle vetorial, nota-se importante diminui o dos riscos da transmiss o transfusional do Trypanosoma cruzi nas áreas trabalhadas. Além de legisla o específica sobre a qualidade da hemoterapia, implementaram-se laboratórios nacionais e regionais de referência, com a assistência da OPS, objetivando-se uma boa sorologia pré-transfusional dos doadores, cuja cobertura tem aumentado. Observa-se ainda uma progressiva diminui o na prevalência da infe o chagásica entre doadores e também um progressivo deslocamento dos doadores infetados para grupos etários mais elevados, como fruto do controle vetorial e do próprio descarte de doadores soro-positivos em doa es anteriores. S o analisados dados e tendências do problema pelos Países, sendo mais preocupante a situa o da Bolívia, com maiores taxas de prevalência e menores de cobertura do programa, ali sendo indicadas a es de quimioprofilaxia, conforme os critérios da OMS. Antevê-se a médio prazo o controle da transmiss o da doen a de Chagas humana na maior parte da Regi o, desde que cumpridas corretamente as etapas do programa em andamento, devidamente consolidadas através de efetiva vigilancia epidemiológica.
Control of Chagas disease vectors
Ramsey,JM; Schofield,CJ;
Salud Pública de México , 2003, DOI: 10.1590/S0036-36342003000200010
Abstract: most latin american countries are making dramatic progress in controlling chagas disease, through a series of national and international initiatives focusing on elimination of domestic populations of triatominae, improved screening of blood donors, and clinical support and treatment of persons infected with trypanosoma cruzi. some countries, particularly uruguay, chile and brazil, are sufficiently advanced in their programmes to initiate detailed planning of the subsequent phases of chagas disease control, while others such as peru, ecuador, and mexico, are currently applying only the initial phases of the control campaigns. in this review, we seek to provide a brief history of the campaigns as a basis for discussion of future interventions. our aim is to relate operational needs to the underlying biological aspects that have made chagas disease so serious in latin america but have also revealed the epidemiological vulnerability of this disease.
Control of Chagas disease vectors
Ramsey JM,Schofield CJ
Salud Pública de México , 2003,
Abstract: Most Latin American countries are making dramatic progress in controlling Chagas disease, through a series of national and international initiatives focusing on elimination of domestic populations of Triatominae, improved screening of blood donors, and clinical support and treatment of persons infected with Trypanosoma cruzi. Some countries, particularly Uruguay, Chile and Brazil, are sufficiently advanced in their programmes to initiate detailed planning of the subsequent phases of Chagas disease control, while others such as Peru, Ecuador, and Mexico, are currently applying only the initial phases of the control campaigns. In this review, we seek to provide a brief history of the campaigns as a basis for discussion of future interventions. Our aim is to relate operational needs to the underlying biological aspects that have made Chagas disease so serious in Latin America but have also revealed the epidemiological vulnerability of this disease.
Active transmission of human chagas disease in Colima Mexico
Coll-Cárdenas, Rafael;Espinoza-Gómez, Francisco;Maldonado-Rodríguez, Arcadio;Reyes-López, Pedro A;Huerta-Viera, Miguel;Rojas-Larios, Fabián;
Memórias do Instituto Oswaldo Cruz , 2004, DOI: 10.1590/S0074-02762004000400004
Abstract: despite efforts to eradicate american trypanosomiasis (at) and chagas disease from the americas, there are still areas of active transmission that can eventually become a source of reinfection in previously controlled regions. mexico could be one of those areas, where there are no formal preventive control programs despite the presence of communities infested by triatominae bugs infected with trypanosoma cruzi. this study explored the prevalence of t. cruzi infection in 405 habitants of 17 communities in the state of colima, on the pacific mexican coast, through a seroepidemiological probabilistic survey. the results revealed a point seroprevalence of 2.4% positive for anti-t. cruzi. in addition, 2 clinical cases of chronic and 2 of acute chagas disease were detected in the explored communities. these findings confirm the risk of active transmission of at in western mexico, especially in rural and suburban communities infested with intra-domestic triatominae, where control programs should be implemented.
Cuticular hydrocarbons of Chagas disease vectors in Mexico
Juárez, M Patricia;Carlson, David A;Salazar Schettino, Paz María;Mijailovsky, Sergio;Rojas, Gloria;
Memórias do Instituto Oswaldo Cruz , 2002, DOI: 10.1590/S0074-02762002000600012
Abstract: capillary gas-liquid chromatography was used to analyse the cuticular hydrocarbons of three triatomine species, triatoma dimidiata, t. barberi and dipetalogaster maxima, domestic vectors of chagas disease in mexico. mixtures of saturated hydrocarbons of straight and methyl-branched chains were characteristic of the three species, but quantitatively different. major methylbranched components mostly corresponded to different saturated isomers of monomethyl, dimethyl and trimethyl branched hydrocarbons ranging from 29 to 39 carbon backbones. sex-dependant, quantitative differences in certain hydrocarbons were apparent in t. dimidiata.
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