Chagas disease is named after the Brazilian physician Carlos Chagas, who discovered the disease in 1909. It is caused by the parasite Trypanosoma cruzi, which is transmitted to animals and people by insect vectors and is found only in the Americas (...mainly, in rural areas of Latin America where poverty is widespread). Chagas disease (T. cruzi infection) is also referred to as American trypanosomiasis
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Chagas disease (American trypanosomiasis) is endemic in 21 countries of the Americas, where control is largely focused on elimination of the domestic insect vectors (Triatominae) coupled with measur...es to extend and improve the screening of blood donors in order to avoid tranfusional transmission. Through national programmes and multinational initiatives coordinated by WHO-PAHO, much has been accomplished in these domains in terms of reducing transmission. Attention now turns to consolidating the successes in interrupting transmission, and improved treatment for those already infected and those who may become affected in the future. This article, based on technical discussions at the "Epidemiological and Sociological Determinants of Chagas Disease, Basic Information to Establish a Surveillance and Control Policy " meeting in Rio de Janeiro, is designed to open the debate on appropriate strategies for continuation of the successful initiatives against Chagas disease.
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Carlos Chagas discovered American trypanosomiasis, also named Chagas disease (CD) in his honor, just over a century ago. He described the clinical aspects of the disease, characterized by its etiological agent (Trypanosoma cruzi) and identified its insect<.../span> vector. Initially, CD occurred only in Latin America and was considered a silent and poorly visible disease. More recently, CD became a neglected worldwide disease with a high morbimortality rate and substantial social impact, emerging as a significant public health threat. In this context, it is crucial to better understand better the epidemiological scenarios of CD and its transmission dynamics, involving people infected and at risk of infection, diversity of the parasite, vector species, and T. cruzi reservoirs. Although efforts have been made by endemic and non-endemic countries to control, treat, and interrupt disease transmission, the cure or complete eradication of CD are still topics of great concern and require global attention. Considering the current scenario of CD, also affecting non-endemic places such as Canada, USA, Europe, Australia, and Japan, in this review we aim to describe the spread of CD cases worldwide since its discovery until it has become a global public health concern.
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The purpose of this handbook is to provide guidance to Member States on the practical aspects of maintaining sanitary standards at international borders at ports, airports, and ground crossings (points of entry) as set out in the International Health Regulations (2005). It provides technical advice ...for developing a comprehensive programme for systematic monitoring of disease vectors and integrated vector control at points of entry. This includes standardizing procedures at points of entry and ensuring a sufficient monitoring and response capacity with the necessary infrastructure for surveillance and control of vectors. In addition, this handbook to serves as reference material for port health officers, regulators, port operators, and other competent authorities in charge of implementing the IHR (2005) at points of entry and on conveyances.
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Cutaneous leishmaniasis (CL) is a neglected infectious endemic disease that is transmitted through the bite of a vector insect (sandfly) of the Lutzomyia genus,typical of rural geographical territories, and causes disfiguring skin ulcers and disabil...ities. It is estimated that CL affects between 600 000 and 1 000 000 people a year around the world, mainly in the America s, the Mediterranean basin, the Middle East and Central Asia. Eighteen of the 21 countries that make up the Latin American (LA) region are considered endemic areas for this neglected tropical disease. Colombia is one of the countries that reports the majority of global cases with 6161 in 2020 and has the second highest number of cases in the Americas, after Brazil.
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Le présent manuel a pour objet d'orienter les États membres sur les aspects pratiques du maintien des normes sanitaires aux frontières internationales dans les ports, les aéroports et les passages à niveau (points d'entrée) énoncés dans le Règlement sanitaire international (2005). Il fourni...t des conseils techniques pour l'élaboration d'un programme complet de surveillance systématique des vecteurs de maladies et de lutte intégrée contre les vecteurs aux points d'entrée.
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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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Chagas disease is caused by Trypanosoma cruzi, a protozoal organism primarily transmitted by triatomine insect vectors, also known as “kissing bugs.” It is a zoonotic disease originally described by Brazilian physician Dr. Carlos Chagas in 1909 ...and is widespread in Latin America. Although triatomines and T. cruzi have long been endemic to the southern United States, awareness and identification of infected vectors and animals have recently increased throughout the United States. Canine Chagas disease can be acute or chronic and is predominantly characterized by inflammation and fibrosis of the heart, resulting in arrhythmias, myocardial dysfunction, heart failure, and sudden death, although many infected dogs are asymptomatic.
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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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Environmental Health in Emergencies and Disasters
Chapter 10
This document provides recommendations on essential measures to protect the health and safety of operators and other persons involved in emergency vector control of Aedes spp. mosquitoes, including space spraying of insecticides, larvicide applicati...on and, in some cases, indoor residual spraying. It is intended to be used by vector control managers and operators, public health workers, medical professionals, district health officers and ministries of health.
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This document provides the specifications for major pesticide application equipment used for control of vectors of diseases. The specification guidelines contained herein are intended to assist national authorities and other public health users in s...electing equipment of assured quality for application of pesticides for vector control.
The test methods described herein are intended to assess whether the equipment will function for a minimum of three years with appropriate routine maintenance according to the manufacturer’s label instructions. Manufacturers shall be requested to provide warranty against manufacturing defects with guaranteed after-sales service on the equipment, any certification required by national authorities regarding materials used in the construction of the equipment, and results of tests that have been carried out for compliance with national or international specifications.
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2nd edition. The interagency field handbook on malaria control was developed to set out effective malaria control responses in humanitarian emergencies, particularly during the acute phase when reli...ance on international humanitarian assistance is greatest. This second edition represents a thorough updating and revision of the first edition. The structure remains similar, but includes an additional chapter on humanitarian coordination. All chapters have been revised to reflect changes in best practices, improvements in technologies, availability of new tools, and changes in WHO recommendations.
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Training module on malaria control