World NTD Day

Neglected tropical diseases (NTDs) impact nearly 1.7 billion people each year, causing serious illness or lifelong disability among many—often leading to stigma and exclusion—and killing an estimated 200,000. The vast majority of sufferers live in the world’s poorest countries.

The World Health Organization’s NTD roadmap 2021-2030 aims to address 20 tropical diseases through prevention, control, elimination, and/or eradication. But despite some progress, reaching all its targets will take better, far more accessible diagnostics and treatments along with more robust strategies, political commitment and resources.

To mark World NTD Day, this collection spotlights work by MSF and collaborators on improving approaches to snakebite envenoming, kala azar and noma. One study presents an innovative artificial intelligence-based snakebite diagnostic tool, while others evaluate shorter, less toxic drug regimens or different models of care. Several commentaries advocate for national/regional strategies adapted to contexts ranging from remote villages to active conflict zones. Another crucial factor is the climate crisis, which is intensifying the transmission and geographic spread of many NTDs.

10 result(s)

Journal Article > ResearchFull Text

PLoS Negl Trop Dis. 21 June 2024; Volume 18 (Issue 6); e0011978.

Musumeci S, Kruse A, Chappuis F, Ostergaard Jensen T, Alcoba G

PLoS Negl Trop Dis. 21 June 2024; Volume 18 (Issue 6); e0011978.

BACKGROUND
Febrile illnesses that persist despite initial treatment are common clinical challenges in (sub)tropical low-resource settings. Our aim is to review infectious etiologies of “prolonged fevers” (persistent febrile illnesses, PFI) and to quantify relative contributions of selected neglected target diseases with limited diagnostic options, often overlooked, causing inadequate antibiotic prescriptions, or requiring prolonged and potentially toxic treatments.

METHODS
We performed a systematic review of articles addressing the infectious etiologies of PFI in adults and children in sub-/tropical low- and middle-income countries (LMICs) using the PRISMA guidelines. A list of target diseases, including neglected parasites and zoonotic bacteria (e.g., Leishmania and Brucella), were identified by infectious diseases and tropical medicine specialists and prioritized in the search. Malaria and tuberculosis (TB) were not included as target diseases due to well-established epidemiology and diagnostic options. Four co-investigators independently extracted data from the identified articles while assessing for risk of bias.

RESULTS
196 articles from 52 countries were included, 117 from Africa (33 countries), 71 from Asia (16 countries), and 8 from Central and -South America (3 countries). Target diseases were reported as the cause of PFI in almost half of the articles, most frequently rickettsioses (including scrub typhus), relapsing fever borreliosis (RF-borreliosis), brucellosis, enteric fever, leptospirosis, Q fever and leishmaniasis. Among those, RF-borreliosis was by far the most frequently reported disease in Africa, particularly in Eastern Africa. Rickettsioses (including scrub typhus) were often described in both Africa and Asia. Leishmaniasis, toxoplasmosis and amoebiasis were the most frequent parasitic etiologies. Non-target diseases and non-tropical organisms (Streptococcus pneumoniae, Escherichia coli, and non-typhoidal Salmonella spp) were documented in a fifth of articles.

CONCLUSIONS
Clinicians faced with PFI in sub-/tropical LMICs should consider a wide differential diagnosis including enteric fever and zoonotic bacterial diseases (e.g., rickettsiosis, RF-borreliosis and brucellosis), or parasite infections (e.g., leishmaniasis) depending on geography and syndromes. In the absence of adequate diagnostic capacity, a trial of antibiotics targeting relevant intra-cellular bacteria, such as doxycycline or azithromycin, may be considered.

Journal Article > CommentaryFull Text

Toxicon: X. 26 February 2023; Volume 18; 100152.

Dalhat MM, Potet J, Mohammed A, Chotun N, Tesfahunei HA, et al.

Toxicon: X. 26 February 2023; Volume 18; 100152.

Africa remains one of the regions with the highest incident and burden of snakebite. The goal of the World Health Organization to halve the global burden of snakebite by 2030 can only be achieved if sub-optimal access to antivenoms in the most affected regions is addressed. We identified upstream, midstream, and downstream factors along the antivenom value chain that prevent access to antivenoms in the African region. We identified windows of opportunities that could be utilized to ensure availability, accessibility, and affordability for snakebite endemic populations in Africa. These include implementation of multicomponent strategies such as intensified advocacy, community engagement, healthcare worker trainings, and leveraging the institutional and governance structure provided by African governments to address the challenges identified.

Journal Article > CommentaryFull Text

Toxicon: X. 21 December 2022; Volume 17; 100146.

Potet J, Singh SN, Ritmeijer KKD, Sisay K, Alcoba G, et al.

Toxicon: X. 21 December 2022; Volume 17; 100146.

The medical humanitarian organization Médecins Sans Frontières (MSF) provides medical care in more than 70 countries and admits more than 7000 cases of snakebite in its facilities each year.

We describe our activities against snakebite in three African countries: Central African Republic, South Sudan and Ethiopia, in which different models of care have been developed. A standard protocol using two different antivenoms depending on the patient's syndrome has been introduced, and a simple blood coagulation test is performed to detect venom-induced coagulopathy. Other services, including surgery for necrotizing wounds, are offered in the facilities where MSF admits a large number of snakebite patients. All services, including provision of antivenom, are offered free-of-charge in MSF-supported facilities. Community-based activities focusing on preventive measures and prompt transport to hospital have been developed in a few MSF projects.

The provision of quality care and treatment, including effective antivenoms, without out-of-pocket payments by the patients, probably explains why MSF has admitted an increasing number of snakebite victims over the last years. This model requires significant resources and monitoring, including regular training of healthcare workers on treatment protocols and a considerable budget for antivenom procurement.

Journal Article > ResearchFull Text

Clin Infect Dis. 15 October 2022; Volume 75 (Issue 8); 1423-1432.

Burza S, Mahajan R, Kazmi S, Alexander N, Kumar D, et al.

Clin Infect Dis. 15 October 2022; Volume 75 (Issue 8); 1423-1432.

BACKGROUND
Visceral leishmaniasis (VL) in patients living with Human-Immunodeficiency-Virus (HIV) present an increasingly important patient cohort in areas where both infections are endemic. Evidence for treatment is sparce, with no high-quality studies from the Indian sub-continent.

METHODS
This is a randomised open label, parallel arm phase-3 trial conducted within a single hospital in Patna, India. 150 patients aged =18 years with serologically confirmed HIV and parasitologically confirmed VL were randomly allocated to one of two treatment arms, either a total 40mg/kg intravenous liposomal amphotericin B(AmBisome) administered in 8 equal doses over 24-days, or a total 30mg/kg intravenous liposomal amphotericin B(AmBisome) administered in 6 equal doses given concomitantly with a total 1.4g oral miltefosine administered through two daily doses of 50mg over 14-days. The primary outcome was ITT relapse-free-survival at day-210, defined as absence of signs and symptoms of VL, or if symptomatic negative parasitological investigations.

FINDINGS
Among 243 patients assessed for eligibility, 150 were recruited between 2nd January 2017 and 5th April 2018, with no loss-to-follow-up. Relapse free survival at day-210 was 85%, (64/75; 95%CI 77-100) in the monotherapy arm, and 96%, (72/75;95%CI 90-100) in the combination arm. 19%(28/150) were infected with concurrent tuberculosis, divided equally between arms. Excluding those with concurrent tuberculosis, relapse free survival at day-210 was 90%, (55/61;95%CI 82-100) in the monotherapy and 97%, (59/61;95%CI 91-100) in the combination therapy arm. Serious adverse events were uncommon and similar in each arm.

CONCLUSIONS
Combination therapy appears to be safe, well tolerated and effective, and halves treatment duration of current recommendations.

Journal Article > ResearchFull Text

Clin Infect Dis. 27 September 2022; Online ahead of print; ciac643.

Musa AM, Mbui J, Mohammed R, Olobo J, Ritmeijer KKD, et al.

Clin Infect Dis. 27 September 2022; Online ahead of print; ciac643.

BACKGROUND
This study aimed to determine whether paromomycin plus miltefosine (PM/MF) is noninferior to sodium stibogluconate plus paromomycin (SSG/PM) for treatment of primary visceral leishmaniasis in eastern Africa.

METHODS
An open-label, phase 3, randomized, controlled trial was conducted in adult and pediatric patients at 7 sites in eastern Africa. Patients were randomly assigned to either 20 mg/kg paromomycin plus allometric dose of miltefosine (14 days), or 20 mg/kg sodium stibogluconate plus 15 mg/kg paromomycin (17 days). The primary endpoint was definitive cure after 6 months.

RESULTS
Of 439 randomized patients, 424 completed the trial. Definitive cure at 6 months was 91.2% (155 of 170) and 91.8% (156 of 170) in the PM/MF and SSG/PM arms in primary efficacy modified intention-to-treat analysis (difference, 0.6%; 97.5% confidence interval [CI], -6.2 to 7.4), narrowly missing the noninferiority margin of 7%. In the per-protocol analysis, efficacy was 92% (149 of 162) and 91.7% (155 of 169) in the PM/MF and SSG/PM arms (difference, -0.3%; 97.5% CI, –7.0 to 6.5), demonstrating noninferiority. Treatments were well tolerated. Four of 18 serious adverse events were study drug–related, and 1 death was SSG-related. Allometric dosing ensured similar MF exposure in children (< 12 years) and adults.

CONCLUSIONS
PM/MF and SSG/PM efficacies were similar, and adverse drug reactions were as expected given the drugs safety profiles. With 1 less injection each day, reduced treatment duration, and no risk of SSG-associated life-threatening cardiotoxicity, PM/MF is a more patient-friendly alternative for children and adults with primary visceral leishmaniasis in eastern Africa.

CLINICAL TRIALS REGISTRATION
NCT03129646.

Journal Article > ReviewFull Text

Lancet Global Health. 1 December 2021; Volume 9 (Issue 12); e1763-e1769.

Alvar J, den Boer ML, Dagne DA

Lancet Global Health. 1 December 2021; Volume 9 (Issue 12); e1763-e1769.

East Africa is the world region most affected by visceral leishmaniasis, accounting for 45% of cases globally that were reported to WHO in 2018, with an annual incidence that is only slightly decreasing. Unlike southeast Asia, east Africa does not have a regional approach to achieving elimination of visceral leishmaniasis as a public health problem. The goal of the WHO 2021-30 Neglected Tropical Diseases road map is to reduce mortality caused by the disease to less than 1%. To achieve this goal in east Africa, it will be necessary to roll out diagnosis and treatment at the primary health-care level and implement evidence-based personal protection methods and measures to reduce human-vector contact. Investment and collaboration to develop the necessary tools are scarce. In this Health Policy paper, we propose a strategic framework for a coordinated regional approach in east Africa for the elimination of visceral leishmaniasis as a public health problem.

Journal Article > CommentaryFull Text

Trop Med Int Health. 3 June 2021; Volume 26 (Issue 9); 1088-1097.

Isah S, Amirtharajah M, Farley ES, Adetunji AS, Samuel J, et al.

Trop Med Int Health. 3 June 2021; Volume 26 (Issue 9); 1088-1097.

The Nigerian Ministry of Health has been offering care for noma patients for many years at the Noma Children's Hospital (NCH) in Sokoto, northwest Nigeria, and Médecins Sans Frontières has supported these initiatives since 2014. The comprehensive model of care consists of four main components: acute care, care for noma sequelae, integrated hospital-based services and community-based services. The model of care is based on the limited evidence available for prevention and treatment of noma and follows WHO's protocols for acute patients and best practice guidelines for the surgical treatment of noma survivors. The model is updated continually as new evidence becomes available, including evidence generated through the operational research studies performed at NCH. By describing the model of care, we wish to share the lessons learned with other actors working in the noma and neglected tropical disease sphere in the hope of guiding programme development.

World NTD Day

Linked Items

MSF Science Portal

World NTD Day

Linked Items

Neglected etiologies of prolonged febrile illnesses in tropical and subtropical regions: A systematic review

Towards an arsenic-free oral treatment for human African trypanosomiasis due to Trypanosoma brucei rhodesiense: a new tool for disease elimination

Anticipating visceral leishmaniasis epidemics due to the conflict in Northern Ethiopia

Availability, accessibility and use of antivenom for snakebite envenomation in Africa with proposed strategies to overcome the limitations

Snakebite envenoming at MSF: A decade of clinical challenges and antivenom access issues

Planetary health and neglected tropical diseases

AmBisome monotherapy and combination AmBisome - miltefosine therapy for the treatment of visceral leishmaniasis in patients co-infected with HIV in India: a randomised open label, parallel arm, phase 3 trial

Paromomycin and miltefosine combination as an alternative to treat patients with visceral leishmaniasis in Eastern Africa: A randomized, controlled, multicountry trial

Towards the elimination of visceral leishmaniasis as a public health problem in East Africa: reflections on an enhanced control strategy and a call for action

Model of care, Noma Children’s Hospital, northwest Nigeria