We developed an integrated vector surveillance (IVS) proposal for cutaneous leishmaniasis (CL) and visceral leishmaniasis (VL) in the Americas, based on eco-epidemiological studies conducted by researchers of the Leishmaniasis Research Network of Ar...gentina. For CL, the transmission was explained in the framework of the edge effect, the increase of vectors and risk of exposure at ecotones and environmental interfaces, and typified as ephemeral, transient, or permanent edges, supporting a cost-effective IVS strategy for early warning of CL outbreaks through an environmental modification alert network, which includes multiple sources of information and actors. In relation to VL, the earliest colonization sites and spatial distribution were explained by modeling and forecasting the most likely hotspots, persistent in time and space, and modulated by environmental variables. Therefore, for VL, a scalar strategy of critical site selection is proposed from a “city” scale based on secondary sources such as remote sensing for the definition of possible areas to monitor and intervene, a scale of restriction from possible to most likely areas through local knowledge, and a “focal site” scale of trap placement through field observation; in this way, IVS activities are carried out at a few sites of the urban landscape and allow a sustainable program.
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Las enfermedades transmitidas por vectores (ETV) son enfermedades infecciosas propagadas por organismos intermediarios como insectos hematófagos, garrapatas, ácaros, caracoles y roedores, que transmiten virus, parásitos y bacterias a los seres hu...manos. Estas enfermedades son la causa de una notable carga de enfermedad y mortalidad, que afecta a las personas enfermas, sus familias y sus comunidades. En la presente publicación se revisan y actualizan los principales métodos e indicadores de vigilancia entomológica, así como las medidas de control vectorial utilizadas contra las ETV en la Región de las Américas. Su elaboración se inscribe en la misión de la Organización Panamericana de la Salud (OPS) de desarrollar actividades encaminadas a fortalecer la capacidad y las buenas prácticas entomológicas en salud pública de los países de la Región. Asimismo, el contenido se ha armonizado con los principios y fundamentos del marco estratégico mundial de la Organización Mundial de la Salud para el manejo integrado de vectores, adoptado como referencia técnica por la OPS para la organización y la estructuración de los programas de control de vectores en la Región. Se trata de un trabajo exhaustivo e integral que proporciona a los responsables de los programas nacionales de control vectorial, epidemiólogos, entomólogos y otros interesados directos acceso rápido a la información más relevante disponible.
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the Lancet : Published Online July 31, 2015 http://dx.doi.org/10.1016/S0140-6736(15)61117-5
The Lancet. Published Online December 22, 2016 http://dx.doi.org/10.1016/S0140-6736(16)32621-6. Open Access
Lancet Infect Dis. 2019 Feb 21. pii: S1473-3099(18)30757-6. doi: 10.1016/S1473-3099(18)30757-6
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eLife 2020;9:e52072. The Triatominae are vectors for Trypanosoma cruzi, the aetiological agent of the neglected tropical Chagas disease. Their distribution stretches across Latin America, with some species occurring outside of the Americas. In parti...cular, the cosmopolitan vector, Triatoma rubrofasciata, has already been detected in many Asian and African countries. We applied an ensemble forecasting niche modelling approach to project the climatic suitability of 11 triatomine species under current climate conditions on a global scale. Our results revealed potential hotspots of triatomine species diversity in tropical and subtropical regions between 21 ̊N and 24 ̊S latitude. We also determined the climatic suitability of two temperate species (T. infestans, T. sordida) in Europe, western Australia and New Zealand. Triatoma rubrofasciata has been projected to find climatically suitable conditions in large parts of coastal areas throughout Latin America, Africa and Southeast Asia, emphasising the importance of an international vector surveillance program in these regions.
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This review focusses on the interactions between the etiologic agent of Chagas disease, Trypanosoma cruzi, and its triatomine vector. The flagellate mainly colonizes the intestinal tract of the insect. The effect of triatomines on trypanosomes is in...dicated by susceptibility and refractoriness phenomena that vary according to the combination of the strains. Other effects are apparent in the different regions of the gut. In the stomach, the majority of ingested blood trypomastigotes are killed while the remaining transform to round stages. In the small intestine, these develop into epimastigotes, the main replicative stage. In the rectum, the population density is the highest and is where the infectious stage develops, the metacyclic trypomastigote. In all regions of the gut, starvation and feeding of the triatomine affect T. cruzi. In the small intestine and rectum, starvation reduces the population density and more spheromastigotes develop. In the rectum, feeding after short-term starvation induces metacyclogenesis and after long-term starvation the development of specific cells, containing several nuclei, kinetoplasts and flagella. When considering the effects of T. cruzi on triatomines, the flagellate seems to be of low pathogenicity. However, during stressful periods, which are normal in natural populations, effects occur often on the behaviour, eg, in readiness to approach the host, the period of time before defecation, dispersal and aggregation. In nymphs, the duration of the different instars and the mortality rates increase, but this seems to be induced by repeated infections or blood quality by the feeding on infected hosts. Starvation resistance is often reduced by infection. Longevity and reproduction of adults is reduced, but only after infection with some strains of T. cruzi. Only components of the surface coat of blood trypomastigotes induce an immune reaction. However, this seems to act against gut bacteria and favours the development of T. cruzi.
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Esta publicación tiene como objetivo fundamental, presentar en lenguaje claro y objetivo, informaciones actualizadas sobre las formas de transmisión de la
enfermedad, sus vectores, su ciclo biológico y métodos de control. Su contenido
se dirig...e, principalmente, a los técnicos y profesionales brasileños que actúan en
el control y en la vigilancia de los vectores de la enfermedad de Chagas y por otro
lado, también a personas que no están familiarizadas con el tema. Entretanto, el
lenguaje simple y objetivo adoptado permite que la obra también pueda ser utilizada
por personas que no están familiarizadas con el asunto.
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interactive map, please follow the link below to use the map functions
updated 31 March 2016
http://ais.paho.org/phip/viz/ed_zika_countrymap.asp
The plan contains the latest available evidence on the extent of insecticide resistance around the world, and puts forward a strategy for global and country levels, identifying clear roles and timelines for all stakeholders. The GPIRM also summarizes information about innovative new products being d...eveloped and sets out the immediate research and development priorities.
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Effective malaria prevention is threatened by widespread and increasing vector insecticide resistance. Failure to mitigate this threat will likely result in an increased burden of disease, with significant cost implications. This new framework provi...des support for the development of a national insecticide resistance monitoring and management plan as part of a national malaria strategic plan.
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Published:February 02, 2021DOI:https://doi.org/10.1016/S0140-6736(21)00234-8
Pour une intervention efficace et efficiente de lutte anti-vectorielle, il est nécessaire de disposer au préalable des informations sur l’écologie, le comportement et la dynamique des populations de vecteurs locaux. Après interventions, il es...t fondamental d'évaluer l'effet des opérations et aussi de pouvoir détecter ou prédire les fluctuations inhabituelles des tendances qui peuvent avoir des conséquences significatives sur la maladie.
Pour cette raison, des scientifiques d'institutions de recherche, des programmes nationaux de lutte contre le paludisme et de l'OMS se sont réunis en Juin 2008, à Libreville (Gabon) pour élaborer le premier projet de document intitulé «procédures opérationnelles standardisées (SOP) pour la surveillance des vecteurs dans le cadre de la surveillance intégrée des maladies et la gestion intégrée des vecteurs ». Le Projet de document a été finalisé par deux consultants et envoyé aux 7 pays pilotes pour être testé sur le terrain.
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