As a high-burden neglected tropical disease, soil-transmitted helminth (STH) infections remain a major problem in the world, especially among children under five years of age. Since young children are at high risk of being infected, STH infection can have a long-term negative impact on their life, i...ncluding impaired growth and development. Stunting, a form of malnutrition in young children, has been long assumed as one of the risk factors in acquiring the STH infections. However, the studies on STH infection in children under five with stunting have been lacking, resulting in poor identification of the risk. Accordingly, we collected and reviewed existing related research articles to provide an overview of STH infection in a susceptible population of stunted children under five years of age in terms of prevalence and risk factors. There were 17 studies included in this review related to infection with Ascaris lumbricoides, Trichuris trichiura, hookworm, and Strongyloides stercoralis from various countries. The prevalence of STH infection in stunted children ranged from 12.5% to 56.5%. Increased inflammatory markers and intestinal microbiota dysbiosis might have increased the intensity of STH infection in stunted children that caused impairment in the immune system. While the age from 2 to 5 years along with poor hygiene and sanitation has shown to be the most common risk factors of STH infections in stunted children; currently there are no studies that show direct results of stunting as a risk factor for STH infection. While stunting itself may affect the pathogenesis of STH infection, further research on stunting as a risk factor for STH infection is encouraged.
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Maps
Maximum point prevalence of schistosome inceftion and location of S. mansoni and S. haematobium surveys.
his first edition describes the standard operating procedures for health products for NTDs amenable to preventive chemotherapy and the medicines donated to treat them. These include albendazole for lymphatic filariasis and soil-transmitted helminthiases; azithromycin for trachoma and yaws; diethylca...rbamazine citrate for lymphatic filariasis; ivermectin for onchocerciasis and lymphatic filariasis; mebendazole for soil-transmitted helminthiases; praziquantel for schistosomiasis; and triclabendazole for foodborne trematodiases. Standard operating procedures for diseases amenable to case management will be covered in subsequent editions, including the application process for requesting medicines (Chapter 1). In the meantime, the procedures described in the rest of the document apply for both case management and preventive chemotherapy NTD health products.
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Schistosomiasis is an infectious disease caused by helminth parasites of the genus Schistosoma. Worldwide, an estimated 250 million people are infected with these parasites with the majority of cases occurring in sub-Saharan Africa. Within Asia, three species of Schistosoma cause disease. Schistosom...a japonicum is the most prevalent, followed by S. mekongi and S. malayensis. All three species are zoonotic, which causes concern for their control, as successful elimination not only requires management of the human definitive host, but also the animal reservoir hosts. With regard to Asian schistosomiasis, most of the published research has focused on S. japonicum with comparatively little attention paid to S. mekongi and even less focus on S. malayensis. In this review, we examine the three Asian schistosomes and their current status in their endemic countries: Cambodia, Lao People’s Democratic Republic, Myanmar, and Thailand (S. mekongi); Malaysia (S. malayensis); and Indonesia, People’s Republic of China, and the Philippines (S. japonicum). Prospects for control that could potentially lead to elimination are highlighted as these can inform researchers and disease control managers in other schistosomiasis-endemic areas, particularly in Africa and the Americas.
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Dickson and Daniel discuss lymphatic filariasis caused by the helminths Wuchereria bancrofti and Brugia malayai.
Human strongyloidiasis is a chronic parasitic disease caused by infection with Strongyloides stercoralis, a soil-transmitted helminth that is estimated to infect 300–600 million people worldwide. This neglected tropical disease (NTD) is endemic globally, predominately in the South-East Asia, Afric...an and Western Pacific regions, and in South and Central America. Strongyloidiasis has a wide range of clinical presentations, including subclinical disease, symptomatic disease (often with diarrhoea, abdominal pain and urticaria) and a rare but deadly complication of hyperinfection with disseminated disease. The feared complication of disseminated strongyloidiasis can occur in the setting of immunocompromising conditions (e.g. human T-cell lymphotropic virus type 1 infection and malignancies) or immunosuppressive medications (e.g. steroids) and has an estimated case-fatality rate exceeding 60%. The standard treatment for chronic S. stercoralis infection is oral medication with ivermectin.
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Int J Hyg Environ Health. 2019 Jun; 222(5): 765–777. doi: 10.1016/j.ijheh.2019.05.004;
To develop updated estimates in response to new exposure and exposure-response data of the
burden of diarrhoea, respiratory infections, malnutrition, schistosomiasis, malaria, soil-transmitted helminth
infec...tions and trachoma from exposure to inadequate drinking-water, sanitation and hygiene behaviours
(WASH) with a focus on low- and middle-income countries.
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Water, sanitation and hygiene (WASH) are critical in the prevention and care for all of the 17 neglected tropical diseases (NTDs) scheduled for intensified control or elimination by 2020.
Provision of safe water, sanitation and hygiene is one of the five key interventions within the global NTD ...roadmap. Yet to date, the WASH component of the strategy has received little attention and the potential to link efforts on WASH and NTDs has been largely untapped.
Focused efforts on WASH are urgently needed if the global NTD roadmap targets are to be met. This is especially needed for NTDs where transmission is most closely linked to poor WASH conditions such as soil-transmitted helminthiasis, schistosomiasis, trachoma and lymphatic filariasis.
This strategy aims to mobilise WASH and NTD actors to work together towards the roadmap targets.
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The disease burden caused by poor water, sanitation and hygiene is significant. For instance, soil transmitted helminthes (hookworm, roundworm, ringworm) infest approximately two billion people. Shistosomiasis infects and debilitates 200 million people. Trachoma, a disease related to poor sanitation... and hygiene which can cause blindness, infects five million people. However, the most serious health impact of poor WASH is diarrheal disease, particularly on children.
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based on the WHO Bench Aids for the diagnosis of intestinal parasites;
Tutor’s Guide: perform specific laboratory techniques; identify intestinal parasites by genus and species; quantify helminth eggs in faeces by Kato-Katz procedure.
The report summarizes the estimates of the burden of disease attributable to unsafe drinking water, sanitation, and hygiene for the year 2019 for four health outcomes - diarrhoea, acute respiratory infections, soil-transmitted helminthiases, and undernutrition - which are included in the reporting o...f the Sustainable Development Goal indicator 3.9.2. The report includes estimates at global, regional and country level for 183 WHO Member States.
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A key component of achieving control and elimination of neglected tropical diseases (NTDs) is effective supply chain management of preventive chemotherapy drugs for Mass Drug Administration (MDA) for trachoma, river blindness, lymphatic filariasis, soil-transmitted helminthiasis and schistosomiasis.... This course explains the end-to-end process from planning and submitting donated drug requests through to waste management of expired and unserviceable stock and reverse logistics of unused tablets. It is essential knowledge for all levels of the health system that must work together to implement MDA.
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South Sudan has a high burden – among the highest in sub-Saharan Africa – of neglected tropical diseases (NTDs). This adversely affects the health and social and economic well-being of people in the country. The prevention, control and eventual elimination of many NTDs depend heavily on improved... access to water, sanitation and hygiene (WASH) and, once there is access, on sound sanitation and hygiene practices. This is especially the case in NTD endemic communities.
The main NTDs prevalent in South Sudan include lymphatic filariasis, schistosomiasis (bilharzia), soiltransmitted helminths (STH), onchocerciasis, trachoma, leishmaniasis and Guinea-worm disease.
While the Ministry of Health (MoH) of South Sudan, through its NTD programme, had prioritized NTD/WASH partnerships and collaboration to improve the national NTD response, the programme lacked resources, capacity and a technical framework to lead the development of a harmonized NTD/WASH communication strategy.
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This report represents the WHO-supported NTDs program activities and key performances in 2023. It is categorized into three sections: The first section states on the disease targeted for eradication (Guinea worm disease); the second section is on the
Preventive Chemotherapy (PC)-NTDs (Trachoma, ...Schistosomiasis, Soil Transmitted Helminthiasis, Onchocerciasis and Lymphatic Filariasis) and the third section is focused on the case management NTDs (Leishmaniasis, Leprosy, Human African
Trypanosomiasis, Noma and other skin NTDs).
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El proyecto “Abordar las Enfermedades Infecciosas Desatendidas (EID) y las arbovirosis en el Chaco Paraguayo” ejecutado en el period 2017-2018 en el Chaco paraguayo por el Ministerio de Salud Pública y Bienestar Social de Paraguay (MSPyBS) con la cooperación técnica de la Representación en e...l Paraguay de la Organización Panamericana de la Salud/ Organización Mundial de la Salud (OPS/OMS) tiene como propósito generar evidencias sobre la capacidad de respuesta del país en esta zona geográfica, a fin de que permita establecer estrategias e intervenciones para fortalecer las capacidades existentes y facilite la toma de acciones oportunas para la prevención, el control y/o eliminación de este conjunto de enfermedades a la luz de los compromisos enmarcados en los Objetivos de Desarrollo Sostenible 2030, la Política Nacional de Salud 2030 y el Plan Estratégico de la OPS/OMS 2014-2019. El proyecto pretende lograr la implementación de un ambicioso sistema de vigilancia integrada (vigilancia epidemiológica, vigilancia de laboratorio y vigilancia entomológica) que proporcione datos de manera oportuna y eficaz para hacer frente a las arbovirosis y a las EID endémicas, como son en Paraguay la enfermedad de Chagas, leishmaniosis, helmintiasis transmitidas por el suelo, teniasis/cisticercosis, la lepra y de forma estratégica se ha incluido al dengue.
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Mapping is a prerequisite for effective implementation of interventions against neglected tropical diseases (NTDs). Before the accelerated World Health Organization (WHO)/Regional Office for Africa (AFRO) NTD Mapping Project was initiated in 2014, mapping efforts in many countries were frequently ca...rried out in an ad hoc and nonstandardized fashion. In 2013, there were at least 2,200 different districts (of the 4,851 districts in the WHO African region) that still required mapping, and in many of these districts, more than one disease needed to be mapped. During its 3-year duration from January 2014 through the end of 2016, the project carried out mapping surveysfor one ormore NTDs in at least 2,500 districts in 37 African countries. At the end of 2016, most (90%) of the 4,851 districts had completed the WHO-required mapping surveys for the five targeted Preventive Chemotherapy (PC)-NTDs, and the impact of this accelerated WHO/AFRO NTD Mapping Project proved to be much greater than just the detailed mapping results themselves. Indeed, the AFRO Mapping
Project dramatically energized and empowered national NTD programs, attracted donor support for expanding these programs, and developed both a robust NTD mapping database and data portal. By clarifying the prevalence and burden
of NTDs, the project provided not only the metrics and technical framework for guiding and tracking program implementation and success but also the research opportunities for developing improved diagnostic and epidemiologic sampling tools for all 5 PC-NTDs—lymphatic filariasis, onchocerciasis, schistosomiasis, soil-transmitted helminthiasis, and trachoma.
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23 March 2021
The meeting addressed the last key area, that is, determining the best method or combination of diagnostic methods for a control programme for S. stercoralis infections in humans.
Dr Montresor’s presentation highlighted that while there is currently no “gold standard” for the... diagnosis of S. stercoralis, there is a felt urgency to optimize diagnostic regimens that are currently available, and in the context of population-based testing (as opposed to individual focused diagnostics in clinical settings).
In other words, the diagnostic test(s) should have good accuracy, but we should remember that in public health we do not aim at individual diagnosis: rather, we need a tool that should help to estimate the prevalence in a population.
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Las geohelmintiasis son una de las parasitosis más comunes en el mundo, y se estima que 1500 millones de personas, el 24 % de la población mundial, están infestadas. Estas infestaciones afectan a las comunidades más pobres y desfavorecidas de zonas tropicales y subtropicales con un acceso defici...ente a servicios de agua limpia, saneamiento e higiene, y la prevalencia más alta se ha notificado en el África subsahariana, China, América del Sur y Asia. Las geohelmintiasis transmiten a través de los huevos de los parásitos eliminados con las heces fecales de las personas infestadas, que, a su vez, contaminan el suelo en zonas donde el saneamiento es deficiente. Más de 260 millones de niños en edad preescolar, 654 millones de niños en edad escolar, 108 millones de niñas adolescentes y 138,8 millones de embarazadas y madres lactantes viven en zonas donde la transmisión de esos parásitos es intensa y, por esa razón, necesitan tratamientos e intervenciones preventivas.
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Les géohelminthiases comptent parmi les infections les plus courantes dans le monde, plus de 1,5 milliard de personnes, soit près de 24 % de la population mondiale, étant infestées à l’échelle mondiale. Ces infections touchent les communautés les plus pauvres et les plus défavorisées ayan...t un accès limité à l’eau potable, à l’assainissement et à l’hygiène dans les régions tropicales et subtropicales, la plus forte prévalence étant recensée en Afrique subsaharienne, en Chine, en Amérique du Sud et en Asie. Elles se transmettent par des œufs présents dans les excréments humains, qui contaminent les sols là où les conditions d’assainissement sont insuffisantes. Plus de 260 millions d’enfants d’âge préscolaire, 654 millions d’enfants d’âge scolaire, 108 millions d’adolescentes et 138,8 millions de femmes enceintes ou allaitantes vivent dans des zones où il existe une transmission à grande échelle de ces parasites et nécessitent un traitement et la mise en place de mesures préventives.
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