Principaux faits
D’après les estimations, 6 à 7 millions de personnes dans le monde sont infectées par Trypanosoma cruzi (T. Cruzi), le parasite responsable de la maladie de Chagas. La plupart de ces personnes vivent en Amérique latine.
La transmission à l’être humain se fait principalem...ent, en Amérique latine, par l’intermédiaire d’un insecte appelé triatome, qui peut être porteur de T. cruzi.
Parmi les autres modes de transmission de la maladie de Chagas, figurent : la transmission orale (par voie alimentaire), la transfusion de sang ou de produits sanguins, la transmission mère-enfant (congénitale), la transplantation d’organes et les accidents de laboratoire.
La maladie de Chagas ne touchait auparavant que des zones rurales de la Région des Amériques, et surtout de l’Amérique latine. Ces dernières décennies, toutefois, les mouvements de population ont fait que la plupart des personnes infectées sont des habitants de zones urbaines (urbanisation) et que la maladie s’est propagée à d’autres continents (où T. cruzi se transmet par des voies non vectorielles).
L’infection à T. cruzi est curable si un traitement est instauré rapidement après l’infection.
Chez les personnes infectées de façon chronique, un traitement antiparasitaire peut éventuellement prévenir ou enrayer la progression de la maladie, et éviter sa transmission, notamment de la mère à l’enfant.
Jusqu’à 30 % des personnes infectées de façon chronique présentent des troubles cardiaques, et jusqu’à 10 % d’entre elles souffrent de troubles digestifs et/ou neurologiques, ce qui peut imposer un traitement particulier.
Les principales méthodes de prévention de la maladie de Chagas en Amérique latine sont la lutte antivectorielle ainsi que d’autres stratégies visant à réduire la transmission vectorielle.
Dans le monde entier, le dépistage sanguin joue un rôle crucial dans la prévention de l’infection par transfusion ou transplantation d’organes.
Il est essentiel de détecter et de traiter l’infection chez les femmes et les filles en âge de procréer, ainsi que de soumettre tout nouveau-né et ses frères et sœurs à un dépistage dans le cas où la mère est infectée et n’a jamais reçu de traitement antiparasitaire.
Certains facteurs socio-économiques et environnementaux influent fortement sur la maladie de Chagas, dont la propagation et les différentes dimensions interdépendantes justifient la nécessité de mettre en œuvre des stratégies de lutte multisectorielles.
Quelques pays ont mis en place la notification et la surveillance des cas aigus et chroniques et des voies de transmission actives, qui sont essentielles à la lutte contre la maladie de Chagas.
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Rabies is a vaccine-preventable, zoonotic, viral disease affecting the central nervous system. Once clinical symptoms appear, rabies is virtually 100% fatal. In up to 99% of cases, domestic dogs are responsible for rabies virus transmission to humans. Yet, rabies can affect both domestic and wild an...imals. It spreads to people and animals via saliva, usually through bites, scratches or direct contact with mucosa (e.g. eyes, mouth or open wounds). Children between the age of 5 and 14 years are frequent victims.
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ProMED - the Program for Monitoring Emerging Diseases - is an Internet-based reporting system dedicated to rapid global dissemination of information on outbreaks of infectious diseases and acute exposures to toxins that affect human health, including those in animals and in plants grown for food or ...animal feed.
By providing early warning of outbreaks of emerging and re-emerging diseases, public health precautions at all levels can be taken in a timely manner to prevent epidemic transmission and to save lives
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La vidéo "Choléra - Questions & Réponses" de l'Organisation Mondiale de la Santé (OMS) explique les aspects essentiels du choléra, une maladie diarrhéique aiguë causée par l'ingestion d'eau ou d'aliments contaminés par la bactérie Vibrio cholerae. Elle met en avant les principaux symptôme...s, notamment une diarrhée aqueuse sévère, des vomissements et une déshydratation rapide, pouvant être mortelle sans traitement adéquat. La transmission se fait principalement par l’eau insalubre et les mauvaises conditions sanitaires. Pour prévenir la maladie, il est essentiel d'avoir accès à de l'eau potable, d'améliorer l'hygiène et l'assainissement, et d'utiliser la vaccination dans les zones à haut risque. En cas d'infection, la réhydratation orale ou intraveineuse est le traitement principal, tandis que les antibiotiques sont parfois administrés dans les cas graves. La vidéo insiste sur l'importance d'une intervention rapide et de mesures préventives pour limiter la propagation du choléra et protéger les populations à risque.
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The video "Cholera - Questions & Answers" by the World Health Organization (WHO) explains the essential aspects of cholera, an acute diarrheal disease caused by ingesting water or food contaminated with the Vibrio cholerae bacterium. It highlights the main symptoms, including severe watery diarrhea,... vomiting, and rapid dehydration, which can be fatal without proper treatment. Transmission occurs primarily through unsafe water and poor sanitation conditions. To prevent the disease, it is crucial to have access to clean drinking water, improve hygiene and sanitation, and use vaccination in high-risk areas. In case of infection, oral or intravenous rehydration is the primary treatment, while antibiotics are sometimes administered in severe cases. The video emphasizes the importance of rapid intervention and preventive measures to limit the spread of cholera and protect at-risk populations.
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Zika virus is primarily transmitted by the Aedes species of mosquito which is also responsible for the spread of dengue, Chikungunya and yellow fever viruses. In most areas, the primary vector of these viruses is Aedes aegypti, with Aedes albopictus a proven or potential vector in some settings. Wel...l-implemented vector control against Aedes using existing tools effectively reduces the transmission of viruses spread by these vectors. Pilot studies are being undertaken on new tools which have potential for future reductions in Aedes populations
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In South and Central America, lymphatic filariasis (LF) is caused by Wuchereria bancrofti, which is transmitted by Culex quinquefasciatus, the only vector species in this region. Of the seven countries considered endemic for LF in the Americas in the last decade, Costa Rica, Suriname and Trinidad a...nd Tobago were removed from the World Health Organization list in 2011. The remaining countries, Brazil, Dominican Republic, Guyana and Haiti, have achieved important progress in recent years. Brazil was the first country in the Americas to stop mass drug administration (MDA) and to establish post-MDA surveillance. Dominican Republic stopped MDA in all LF-endemic foci: La Ciénaga and Southwest passed the third Transmission Assessment Survey (TAS) and the Eastern focus passed TAS-1 in 2018. Haiti passed the TAS and interrupted transmission in >80% of endemic communes, achieving effective drug coverage. Guyana implemented effective coverage in MDAs in 2017 and 2018 and in 2019 scaled up the treatment for 100% of the geographical region, introducing ivermectin in the MDA in order to achieve LF elimination by the year 2026. The Americas region is on its way to eliminating LF transmission. However, efforts should be made to improve morbidity management to prevent disability of the already affected populations.
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Schistosomiasis is an acute and chronic parasitic disease caused by blood flukes (trematode worms) of the genus Schistosoma. Estimates show that at least 251.4 million people required preventive treatment in 2021. Preventive treatment, which should be repeated over a number of years, will reduce and... prevent morbidity. Schistosomiasis transmission has been reported from 78 countries. However, preventive chemotherapy for schistosomiasis, where people and communities are targeted for large-scale treatment, is only required in 51 endemic countries with moderate-to-high transmission.
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PLoS Negl Trop Dis 13(10): e0007694. In 2005, the World Health Organization (WHO) recognized Chagas disease (CD; Trypanosoma cruzi infection) as a neglected tropical disease (NTD) [1] and included it into the global plan to combat NTDs [2]. The Target 3.3 of the United Nations Sustainable Developmen...t Goals (UN/SDG) aims at ending the epidemics of NTDs by 2030 [3]. Mother-to-child (congenital/connatal) transmission is currently the main mode of transmission of T. cruzi over blood transfusions and organ transplantations in vector-free areas within and outside Latin America (LA). Based on recent demonstrations that congenital transmission can be prevented [4–7], WHO has shifted its objective, in 2018, from control to elimination of congenital CD (cCD).
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This strategic document is relevant to the diverse contexts that exist across the WHO European Region, and to countries implementing a wide range of national and subnational responses. The strategy is flexible and adaptable to national and subnational contexts and guides countries in rapidly bringin...g COVID-19 cases under control, and in preparing for a phased transition from a widespread transmission to a steady state of low-level or no transmission.
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Lymphatic filariasis is a vector-borne neglected tropical disease that causes damage of the lymphatic system and can lead to lymphoedema (elephantiasis) and hydrocele in infected individuals. The global baseline estimate of persons affected by lymphatic filariasis is 25 million men with hydrocele an...d over 15 million people with lymphoedema. At least 36 million persons remain with these chronic disease manifestations. The disease is endemic in 72 countries. In 2016, an estimated total population of 856 million were living in areas with ongoing transmission of the causative filarial parasites and requiring mass drug administration (MDA). Lymphatic filariasis disfigures and disables, and often leads to stigmatization and poverty. Hundreds of millions of dollars are lost annually due to reduced productivity of affected patients. WHO has ranked the disease as one of the world’s leading causes of permanent and long-term disability.
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This guideline provides advice in regards to applications for Marketing Authorisations for antimicrobial veterinary medicinal products (VMPs) on the data required and the methodology to be used for performing an assessment of the risk to public health from antimicrobial resistance (AMR) due to use o...f the product. The scope of the guidance extends to VMPs intended for food producing species and to the transmission of AMR by the foodborne route or through direct contact with treated animals.
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O Plano Nacional de Preparação e Resposta para a doença por novo coronavírus (COVID-19) é uma ferramenta estratégica de preparação e resposta a uma potencial epidemia pelo vírus SARS-CoV-2. Este Plano tem como referencial as orientações da Organização Mundial da Saúde e do Centro Europ...eu de Prevenção e Controlo de Doenças, sendo o documento de referência nacional no que respeita ao planeamento da resposta a COVID-19. Apesar do conhecimento atualmente disponível em relação a características do SARSCoV-2 nomeadamente o seu comportamento patogénico, potencial de transmissibilidade e outros fatores determinantes não estar completo, é útil considerar, para efeitos de implementação de medidas, uma analogia entre a atual epidemia por SARS-CoV-2 e a gripe pandémica. Apesar de desafiantes, estas características tornam ainda mais premente o planeamento estruturado para diferentes cenários nesta emergência de saúde pública.
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Dans ce rapport, le Partnership for Evidence-Based Response to COVID-19 (PERC), un consortium d’organisations mondiales de santé publique et d’entreprises privées, fait la synthèse des résultats d’une enquête conduite du 29 mars au 17 avril 2020 dans 28 villes des États Membres de l’UA.... Ce rapport présente également les mesures épidémiologiques en matière de transmission de la maladie ainsi que les indicateurs relatives aux déplacements des populations et aux troubles civils. Dans l’ensemble, ces données donnent un aperçu unique des conditions initiales en Afrique pendant cette pandémie en évolution rapide.
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Persons with acute respiratory illness with sudden onset of at least one of the following: cough, sore throat, shortness of breath or fever [≥ 38°C (measured) or history of fever (subjective)] irrespective of admission status AND In the 14 days prior to onset of symptoms, met at least one of the ...following epidemiological criteria: Were in close contact1 with a confirmed2 or probable3 case of SARS-CoV-2 infection; OR Had a history of travel to areas with presumed ongoing community transmission of SARS-CoV-2; (Visit WWW.NICD.AC.ZA for an updated case definition). OR Worked in, or attended a health care facility where patients with SARS-CoV-2 infections were being treated. OR Admitted with severe pneumonia of unknown aetiology.
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Chagas disease or American trypanosomiasis is, together with geohelminths, the neglected disease that causes more loss of years of healthy life due to disability in Latin America. Chagas disease, as determined by the factors and determinants, shows that different contexts require different actions, ...preventing new cases or reducing the burden of disease. Control strategies must combine two general courses of action including prevention of transmission to prevent the occurrence of new cases (these measures are cost effective), as well as opportune diagnosis and treatment of infected individuals in order to prevent the clinical evolution of the disease and to allow them to recuperate their health. All actions should be implemented as fully as possible and with an integrated way, to maximise the impact. Chagas disease cannot be eradicated due because of the demonstrated existence of infected wild triatomines
in permanent contact with domestic cycles and it contributes to the occurrence of at least few new cases. However, it is possible to interrupt the transmission of Trypanosoma cruzi in a large territory and to eliminate Chagas disease
as a public health problem with a dramatic reduction of burden of the disease.
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During the year 2022, COVID-19 continued to be a significant challenge in Eritrea as in many other countries across the world. As COVID-19 devastated communities around the world, WHO worked with the MoH to strengthen the National and Sub-National health systems in order to meet community needs and ...mitigate the devastation during the pandemic and beyond.
One of the major achievements in the year 2022 was the beginning of the journey towards validation of
the elimination of mother to child transmission of HIV, syphilis, and hepatitis B. This is the culmination of years
of commitment and determination by the political leadership, national and international partnerships to
reduce the associated indices to levels that qualify for elimination.
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This position paper supersedes the 2022 WHO position paper on malaria vaccines. It includes the updated WHO recommendations on the use of the RTS,S/AS01 and R21/Matrix-M vaccines for the reduction of malaria morbidity and mortality in children living in endemic areas, prioritizing areas of moderate ...and high malaria transmission.
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The goals of Ebola virus disease (EVD) surveillance during Phase 3 of the Ebola response are to promptly detect new, suspected EVD cases and deaths so as to trigger appropriate response, including rapid diagnosis, case isolation and management, contact tracing, safe burials, and the identification o...f transmission chains
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Recent systematic reviews and meta-analysis of the impact of chemical-based mollusciciding (King et al., 2015, Sokolow et al., 2016) have concluded that regular mollusciciding is likely to contribute significantly towards elimination of schistosomiasis in high-risk areas. The WHO roadmap’s new foc...us on “transmission control, wherever possible” (WHO, 2012a) reinforces the need to promote intermediate-host snail control to prevent schistosomiasis transmission.
This operational manual is intended to facilitate the reintroduction of practices and protocols for use of molluscicides in the field in schistosomiasis control programmes. It is complemented by guidelines on the laboratory and field testing of the efficacy of molluscicides for schistosomiasis control (WHO, 2017 [in preparation]).
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