The Institut Pasteur has created a MOOC entirely focused on Malaria, providing a glimpse of the wide range of disciplines involved and questions addressed in malaria research. It goes from basic cell and molecular biology of malaria parasites to field and hosp...ital based clinical research on malaria pathology. It covers the application of the latest genomic-based to investigate parasite biology to translational research on development of new control tools, including drugs and vaccines. It also deals with malaria epidemiology and clinical research, to better under-stand malaria as a public health
problem.
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The report focuses on antibacterial resistance (ABR) in common bacterial pathogens. There is a major gap in knowledge about the magnitude of this problem. Antimicrobial resistance (AMR) threatens the effective revention and treatment of an ever-increasing range of infections caused by bacteria, para...sites, viruses and fungi. This WHO report, produced in collaboration with Member States and other partners, provides for the first time, as accurate a picture as is presently possible of the magnitude of AMR and the current state of surveillance globally. It examines the information on AMR, in particular antibacterial resistance (ABR), at country level worldwide.
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Antimicrobial resistance has become a serious public health threat for effective treatment of an ever increasing range of infections caused by bacteria, parasites, viruses and fungi. When infections can no longer be treated by first-line antibiotics, other antibiotics must be used, which are both mo...re expensive and more toxic. Treatment and hospitalization is prolonged, and patients undergoing operations and other medical procedures are more vulnerable to infections. All this imposes a huge burden on health care systems and on the economy of countries. This is a major challenge to the health system in Mauritius which provides health care free of user cost to the whole population.
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Antimicrobial resistance (AMR) is a natural phenomenon in which microorganisms such as bacteria, viruses, fungi and parasites adapt to antimicrobial agents and cause medications to be ineffective for its curing purpose. AMR is often the consequence of any use o...f antimicrobial drugs, exacerbated by inappropriate use.
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La résistance à un antimicrobien survient quand un micro-organisme (bactérie, virus, champignon ou parasite), devient résistant à un médicament antimicrobien vis-à-vis duquel il était auparavant sensible . Cette résistance aux antimicrobiens (RAM), concerne un large ...ventail d’agents infectieux, et de nombreux secteurs d’activités (santé humaine et animale, agro-industrie, élevage, environnement). Elle représente une menace croissante pour la santé publique et aucun pays n’est épargné. Il est particulièrement alarmant de constater la propagation rapide, dans le monde entier, des bactéries multirésistantes provoquant des infections courantes qui ne sont pas sensibles aux traitements antibiotiques habituellement utilisés, ainsi que des infections en particulier hospitalières, résistantes aux traitements antibiotiques de dernier recours . Le problème se pose actuellement en termes de développement durable : il dépasse largement le cadre de la santé humaine et interpelle le monde entier
AMR CONTROL – ÉDITION FRANÇAISE VOL.1
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La résistance aux antimicrobiens Esurvient lorsque les micro-organismes (bactéries, champignons, virus et parasites) évoluent quand ils sont exposés à des médicaments antimicrobiens (comme les antibiotiques, les antifongiques, les antiviraux, les antipaludiques et les anthelminthiques).
On ap...pelle parfois «super bactéries» celles qui développent une résistance aux antimicrobiens, mais cela concerne tous les micro-organismes.
En conséquence, les médicaments perdent leur efficacité et les infections persistent dans l’organisme, augmentant le risque de transmission à d’autres personnes.
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A systematic review of clinical and observational antiparasitic treatment studies to assess the potential for establishing an individual participant-level data platform.
Chagas disease (CD), caused by the parasite Trypanosoma cruzi, affects ~6–7 million people worldwide. Significant limitations s...till exist in our understanding of CD. Harnessing individual participant data (IPD) from studies could support more in-depth analyses to address the many outstanding research questions. This systematic review aims to describe the characteristics and treatment practices of clinical studies in CD and assess the breadth and availability of research data for the potential establishment of a data-sharing platform.
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Chagas disease, or American trypanosomiasis, is a condition that causes gradual organ damage. Without treatment, it can be fatal.
This article explains where the T. cruzi parasite is most common and how it can spread. It also outlines the symptoms of Chagas disease and the treatment options avail...able.
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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 pover...ty is widespread). Chagas disease (T. cruzi infection) is also referred to as American trypanosomiasis
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DNDi’s long-term goal for sleeping sickness, also known as human African trypanosomiasis (HAT), is to develop and register two new drugs that are effective against both Stage 1 and Stage 2 of the disease and both subspecies of the parasite, T.b. gambiense and T.b. rhodesiense. T.b. rhodesiense is ...an acute form of the disease, occurring primarily in Eastern and Southern Africa. Better treatments for T.b. rhodesiense sleeping sickness are urgently needed.
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Schistosomiasis, commonly known as bilharzia, is an acute and chronic tropical disease caused by trematodes of the genus Schistosoma. The schistosome parasite is transmitted through a snail intermediate host with the human being the definitive host. Worldwide, schistosomiasis continues to cause a pu...blic health problem with 779 million people exposed to the infection. The disease is present in 78 countries and endemic in 52 of those countries where an estimated 90% of people need treatment. Schistosomiasis has been successfully controlled in many countries but its burden remains high in Africa, particularly in sub-Saharan countries.
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Leishmaniasis is a major vector-borne disease caused by obligate intramacrophage protozoa of the genus Leishmania, and transmitted by the bite of phlebotomine female sand flies of the genera Phlebotomus and Lutzomyia, in the old and new worlds, respectively. Among 20 well-recognized Leishmania speci...es known to infect humans, 18 have zoonotic nature, which include agents of visceral, cutaneous, and mucocutaneous forms of the disease, in both the old and new worlds. Currently, leishmaniasis show a wider geographic distribution and increased global incidence. Environmental, demographic and human behaviors contribute to the changing landscape for zoonotic cutaneous and visceral leishmaniasis. The primary reservoir hosts of Leishmania are sylvatic mammals such as forest rodents, hyraxes and wild canids, and dogs are the most important species among domesticated animals in the epidemiology of this disease. These parasites have two basic life cycle stages: one extracellular stage within the invertebrate host (phlebotomine sand fly), and one intracellular stage within a vertebrate host. Co-infection with HIV intensifies the burden of visceral and cutaneous leishmaniasis by causing severe forms and more difficult to manage. The disease is endemic to Ethiopia, and the clinical signs are not pathognomic. The visceral form (Kala-azar) may be confused with other similar conditions such as malaria, tropical splenomegaly, schistosomiasis, milliary tuberculosis, and brucellosis. Similarly, cutaneous leishmaniasis should be differentiated from disease like tropical ulcers, impetigo and leprosy. There are several methods of laboratory diagnosis of leishmaniasis, including parasitological, immunological and molecular. Different forms of treatments are available including oral, parenteral, and topical medications such as pentavalent antimonials, liposomal amphotericin B, miltefosine and paromomycin. Methods of control are largely limited to destruction of animal reservoirs, treatment of infected humans, and management of sand fly populations. Development of an effective vaccine against leishmaniasis has been largely unsuccessful and hinders its prevention.
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Leishmaniases are a group of diseases of zoonotic importance caused by over 20 species of protozoa of the genus Leishmania, in which domestic dogs are considered to be the main reservoir for the disease. However, the involvement of other vertebrates as reservoirs for these parasites has also been in...vestigated. Therefore, the objective of the present study was to carry out a systematic review with meta-analysis on occurrences of leishmaniasis in equids. The case reports described animals with cutaneous symptoms of leishmaniasis (papules, nodules, ulcers or crusts) that regressed spontaneously, located mainly on the head and limbs, from which three species of protozoa were identified in the lesions: Leishmania braziliensis, Leishmania infantum and Leishmania siamensis. In turn, the meta-analysis showed a combined prevalence of 25%, although with high heterogeneity among the studies, which was attributed to the use of different methods for diagnosing the disease. Leishmaniasis in equids is a benign disease but it should be included in the differential diagnosis of cutaneous diseases among these species. Seroepidemiological studies are important in investigating and monitoring suspected exposure of these hosts to the parasite, especially in endemic areas. However, there is also a need to standardize diagnostic methods.
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A century after its discovery, Chagas' disease still represents a major public health challenge in Latin America. Moreover, because of growing population movements, an increasing number of cases of imported Chagas' disease have now been detected in non-endemic areas, such as North America and some E...uropean countries. This parasitic zoonosis, caused by Trypanosoma cruzi, is transmitted to humans by infected Triatominae insects, or occasionally by non-vectorial mechanisms, such as blood transfusion, mother to fetus, or oral ingestion of materials contaminated with parasites. Following the acute phase of the infection, untreated individuals enter a chronic phase that is initially asymptomatic or clinically unapparent. Usually, a few decades later, 40-50% of patients develop progressive cardiomyopathy and/or motility disturbances of the oesophagus and colon. In the last decades several interventions targeting primary, secondary and tertiary prevention of Chagas' disease have been attempted. While control of both vectorial and blood transfusion transmission of T cruzi (primary prevention) has been successful in many regions of Latin America, early detection and aetiological treatment of asymptomatic subjects with Chagas' disease (secondary prevention) have been largely underutilised. At the same time, in patients with established chronic disease, several pharmacological and non-pharmacological interventions are currently available and have been increasingly used with the intention of preventing or delaying complications of the disease (tertiary prevention). In this review we discuss in detail each of these issues.
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The previous report of the WHO Expert Committee on this disease
followed a meeting in 1995. Intensive, coordinated efforts against HAT during
the intervening 18 years have resulted in a decrease in incidence to a point at
which elimination is considered feasible. This report provides informati...on about
new diagnostic approaches, new therapeutic regimens and better understanding
of the distribution of the disease with high-quality mapping. The roles of human
and animal reservoirs and the tsetse fly vectors that transmit the parasites are
emphasized. The new information has formed the basis for an integrated strategy
with which it is hoped that elimination of HAT will be achieved. The report also
contains recommendations on the approaches that will lead to elimination of the
disease.
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Soil-transmitted helminth (STH) infections are among the most common infections worldwide with an estimated 1.5 billion infected people or 24% of the world’s population. These infections affect the poorest and most deprived communities with poor access to clean water, sanitation and hygiene in tro...pical and subtropical areas, with the highest prevalence reported from sub-Saharan Africa, China, South America and Asia. They are transmitted by eggs present in human faeces, which in turn contaminate soil in areas where sanitation is poor. Over 260 million preschool-age children, 654 million school-age children,108 million adolescent girls and 138.8 million pregnant and lactating women live in areas where these parasites are intensively transmitted, and are in need of treatment and preventive interventions.
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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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Following the publication of Guidelines on certification of elimination of human onchocerciasis in 2001 by the World Health Organization (WHO), these are the first evidence-based guidelines developed by NTD Department according to the international standards. They provide a set of recommendations th...at would guide national programme managers in collaboration with their respective oversight committees on when to stop mass drug administration (MDA) and conduct post-treatment surveillance (PTS) activities for a minimum period of 3 to 5 year before confirming the interruption of transmission of Onchocerca volvulus parasite and hence its elimination. They also include steps to undertake for verification of elimination of transmission of the parasite in the whole endemic country by the International Verification Team (IVT) prior to the official acknowledgement by WHO Director General.
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Chronic manifestations of Chagas disease present as disabling and life-threatening conditions affecting mainly the cardiovascular and gastrointestinal systems. Although meaningful research has outlined the different molecular mechanisms underlying Trypanosoma cruzi’s infection and the host-parasit...e interactions that follow, prompt diagnosis and treatment remain a challenge, particularly in developing countries and also in those where the disease is considered non-endemic. This review intends to present an up-to-date review of the parasite’s life cycle, genetic diversity, virulence
factors, and infective mechanisms, as well as the epidemiology, clinical presentation, diagnosis, and treatment options of the main chronic complications of Chagas disease.
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Antimicrobials are medicines, including antibiotics, antivirals, antifungals, and antiparasitics, that are used to prevent and treat infections in humans, animals, and plants. Antimicrobial Resistance (AMR) arises when bacteria, viruses, fungi, and parasites no longer respond to these medicines, ren...dering them ineffective and making infections more difficult to treat. This resistance increases the risk of disease spread, severe illness, disability, and death. Although AMR is a natural phenomenon driven by genetic
changes in pathogens, it is significantly accelerated by human activities such as the misuse and overuse of antimicrobials in healthcare, agriculture, and animal husbandry.
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