What Is Tropical Medicine and Global Health Research?

Tropical medicine is the branch of medicine and biomedical research concerned with diseases that are most common, or most neglected, in tropical and subtropical regions, and with the social and environmental conditions that sustain them. Global health research is the wider enterprise of improving health and reducing inequities for populations worldwide, with particular attention to low- and middle-income settings. The two overlap heavily in practice. This guide explains what each covers, the main subfields and methods, how neglected tropical disease research is organized, the societies and funders that anchor the field, how research in low- and middle-income settings is governed ethically, and how the work connects to research administration.

What Is Tropical Medicine?

Tropical medicine grew out of the practical need to understand and treat infections that physicians trained in temperate climates rarely met. Its subject matter is not defined by a single kind of pathogen. Malaria is caused by a protozoan, schistosomiasis by a flatworm, dengue by a virus, leprosy and trachoma by bacteria, and some fungal and toxin-mediated conditions are included too. What unites them is geography, poverty, and the fact that many receive less research investment than their burden would suggest. For that reason the field has always been multidisciplinary: clinicians, parasitologists, virologists, bacteriologists, entomologists, epidemiologists, social scientists and health-systems researchers all work within it.

The World Health Organization describes neglected tropical diseases (NTDs) as a diverse group of conditions caused by a variety of pathogens, including viruses, bacteria, parasites, fungi and toxins, with serious health and economic impacts, primarily affecting impoverished communities in tropical regions. WHO’s current NTD page lists 25 conditions, among them Buruli ulcer, Chagas disease, dengue and chikungunya, leprosy, lymphatic filariasis, rabies, schistosomiasis, soil-transmitted helminthiases, trachoma and yaws, and reports that more than a billion people are affected.

What Is Global Health Research?

Global health research asks how to improve health and health equity across borders. It includes infectious disease, but also maternal and child health, nutrition, non-communicable disease, mental health, injury, health systems and financing, and the effects of climate and migration. Where tropical medicine is organized around a set of diseases, global health is organized around a problem: why do some populations bear a disproportionate burden, and what interventions, policies and delivery systems close the gap? Related disciplines include public health, epidemiology, health economics and bioethics.

The two terms are often used together because the problems overlap, but the emphasis differs. Tropical medicine tends to be more clinical and pathogen-focused; global health research tends to be more population-level, interdisciplinary and policy-oriented. A single project, for example a trial of a mass drug administration strategy, can belong to both.

Core Subfields

Parasitic Disease Research

Many of the best-known tropical diseases are parasitic: malaria, leishmaniasis, trypanosomiasis, schistosomiasis and the filarial infections. Research here covers parasite biology, life cycles, transmission, drug resistance and vector interactions. See What Is Parasitology? for the foundational discipline, including protozoology, helminthology and medical entomology.

Viral and Vector-Borne Infections

Dengue, chikungunya, rabies and other arboviral and zoonotic infections draw on virology, vector biology and ecology. Research addresses surveillance, vaccine development, diagnostics and the way climate, urbanization and land use shape transmission.

Bacterial Neglected Diseases

Leprosy, Buruli ulcer, trachoma and yaws are bacterial in origin, and bacterial infections such as cholera and tuberculosis also sit within the wider global health agenda. The relevant science is described in What Is Bacteriology? and What Is Microbiology?, including antimicrobial resistance, which cuts across all of these.

Epidemiology and Implementation Science

Counting cases, mapping risk, modeling transmission and evaluating whether an intervention works in real health systems are as important as laboratory discovery. Epidemiology supplies the study designs; implementation research asks how proven tools actually reach people. See also immunology for the host-response side of vaccine and diagnostic work.

Health Systems and Social Science

Whether a treatment is used depends on cost, distance, stigma, trust and the capacity of local services. Anthropologists, economists and health-policy researchers study these determinants, and their findings often decide whether a scientific advance changes outcomes.

Neglected Tropical Disease Research

NTDs are a defined policy category as well as a scientific one. Because many affect people with little purchasing power, the commercial incentive to develop drugs, vaccines and diagnostics has historically been weak. Public and philanthropic funders and product-development partnerships therefore play an outsized role. WHO’s 2021–2030 NTD roadmap sets global targets, which WHO states as a 90% reduction in the number of people requiring NTD treatment, a 75% reduction in NTD-related disability-adjusted life years, at least 100 countries eliminating at least one NTD, and eradication of two diseases, dracunculiasis and yaws.

Research on NTDs spans the whole pipeline: basic biology, target identification, drug and vaccine discovery, diagnostics suited to low-resource settings, vector control, and operational research on mass treatment programmes. Policy incentives also exist on the regulatory side; the US priority review voucher is one example of a mechanism aimed at encouraging development for neglected diseases.

Methods

• Field epidemiology and surveys: household and community surveys, cross-sectional prevalence studies and longitudinal cohorts in endemic areas.
• Clinical trials: randomized trials of drugs, vaccines and strategies, often cluster-randomized when the intervention acts at community level, as with mass drug administration or vector control. Trials are commonly registered in public registries; see WHO ICTRP.
• Laboratory and genomic methods: culture, microscopy, molecular diagnostics, sequencing for surveillance and drug-resistance tracking. Laboratory quality systems matter here; see Good Clinical Laboratory Practice (GCLP).
• Entomology and vector surveillance: trapping, species identification, insecticide-resistance testing and ecological modelling.
• Mathematical and statistical modelling: transmission models used to project the effect of interventions and to set elimination targets, relying on biostatistics.
• Qualitative and participatory research: interviews, focus groups and participatory research to understand acceptability and barriers to care.
• Health economics: cost-effectiveness analysis using measures such as the QALY and disability-adjusted life years.

Research in Low- and Middle-Income Settings: Ethics and Equity

Much of this research takes place in settings classed as low- and middle-income countries (LMIC), often with sponsors and lead institutions based elsewhere. That arrangement raises ethical questions that the field treats as central rather than peripheral.

Ethical Review and Informed Consent

Studies require approval from a research ethics committee, and for externally sponsored studies commonly both the sponsor’s and the host country’s review. The Declaration of Helsinki is the widely cited statement of ethical principles for medical research involving human participants, and valid informed consent is a core requirement. In communities with low literacy or where decisions are made collectively, consent processes may need adapting, for example through oral consent, translated materials, and engagement with community leaders in addition to, not instead of, individual consent. Examples of national review bodies in the guides library include KEMRI in Kenya and NHRC in Nepal.

Community Engagement

Engagement means involving affected communities in setting priorities, designing studies and interpreting results, not merely informing them afterwards. Mechanisms include a community advisory board, co-production approaches and public engagement activities. Good engagement improves recruitment, trust and the relevance of findings.

Benefit Sharing and Fair Partnership

Benefit sharing asks what the host community and country receive in return for participating: access to proven interventions after a trial, capacity strengthening, shared authorship, and fair terms on data and samples. Formal arrangements for biological material and associated knowledge are described in the entry on a benefit sharing agreement. Equitable partnership also covers who holds data ownership, who leads publications, and whether local investigators are partners rather than data collectors. Funders and TDR-style programmes increasingly make research capacity strengthening in disease-affected countries an explicit aim.

Standards of Care and Post-Trial Access

Choosing a comparator, deciding what care participants receive, and planning access to a successful product after the trial ends are recurring, debated questions. They should be settled in the protocol and agreements before enrolment, not after.

A Brief History

The field’s professional institutions are older than its current vocabulary. The American Society of Tropical Medicine was founded in 1903 and merged with the National Malaria Society, founded in 1940, in 1951 to form today’s American Society of Tropical Medicine and Hygiene (ASTMH). The shift from “tropical medicine” to “global health” as an organizing label reflects a broadening from a set of regional diseases toward worldwide health equity, but the older name persists in societies, journals and training programmes.

Societies, Journals and Intergovernmental Programmes

• ASTMH describes itself as the largest international scientific organization of experts dedicated to reducing the worldwide burden of tropical infectious diseases and improving global health. It publishes the American Journal of Tropical Medicine and Hygiene and holds an annual scientific meeting with pitch competitions and pre-meeting educational courses.
• WHO TDR, the Special Programme for Research and Training in Tropical Diseases, is co-sponsored by UNICEF, UNDP, the World Bank and WHO. Its stated mission is to support effective and innovative global health research by strengthening the research capacity of disease-affected countries and promoting the translation of evidence into interventions. It focuses on infectious diseases of poverty, including malaria, tuberculosis, vector-borne diseases and NTDs, and runs postgraduate training schemes, regional training centres, clinical research fellowships, operational research training (SORT IT) and women-in-science initiatives.
• WHO sets normative guidance and coordinates the NTD roadmap discussed above.
• Discipline-specific societies, such as those for parasitology, virology or infectious diseases, and regional bodies in endemic countries, also anchor the community.

How the Work Is Funded

Funding is spread across public agencies, philanthropies and intergovernmental programmes, and most large awards are consortia that include partners in endemic countries.

• NIH, chiefly NIAID, is the principal US public funder of infectious disease research, including tropical and neglected disease research. Individual funding opportunities and paylines change, so check current announcements; the NIAID payline entry explains how NIAID funding decisions are described.
• Wellcome states that it aims to back science to deliver vaccines and treatments where they are needed most. Its infectious disease priorities include tuberculosis, cholera, vector-borne diseases such as schistosomiasis, leishmaniasis and dengue, and drug-resistant infections. Wellcome reports awarding £888.3 million across infectious disease research in 83 countries for 2021–2026.
• The Gates Foundation is a major philanthropic funder of global health research; see Gates Foundation research grant programs.
• WHO TDR funds research and capacity building directly, as described above.
• Bilateral and multilateral sources, including official development assistance, support parts of the field. Contributions toward the Sustainable Development Goals frame much of this investment.

Training and Careers

Routes into the field are varied. Clinicians often pursue a diploma or master’s in tropical medicine or public health followed by fellowships; laboratory scientists enter through doctoral training in parasitology, virology, microbiology or immunology; epidemiologists and modellers come from quantitative backgrounds; and social scientists bring methods from anthropology and economics. Many programmes include fieldwork in endemic countries, and fellowships such as those run by TDR aim to build research careers within disease-affected countries. Settings include universities, research institutes, ministries of health, nongovernmental organizations, product-development partnerships and industry.

How Tropical Medicine and Global Health Research Connects to Research Administration

International, multi-site projects raise administrative questions that differ from domestic work. Sub-awards to foreign institutions require due diligence and agreed financial reporting; export controls and sample-transfer agreements govern shipping biological material; biosafety and laboratory-quality systems must be in place; and ethics approvals must be obtained in each jurisdiction, with timelines that affect the project schedule. Data-sharing plans must reconcile funder policies with local law and community expectations, and authorship agreements should be settled early. Indirect cost rates and currency differences complicate budgets, and capacity strengthening must be costed rather than assumed. Research offices that understand these issues help investigators keep partnerships fair and compliant.

Frequently Asked Questions

What is the difference between tropical medicine and global health?

Tropical medicine is organized around diseases of tropical regions and leans clinical and pathogen-focused. Global health is organized around health equity worldwide and covers any health problem, infectious or not, that affects populations unevenly. They overlap substantially.

What counts as a neglected tropical disease?

WHO describes NTDs as a diverse group of conditions caused by pathogens including viruses, bacteria, parasites, fungi and toxins, affecting mainly impoverished tropical communities, and lists 25 of them on its current page.

What does WHO TDR do?

TDR is a research and training programme co-sponsored by UNICEF, UNDP, the World Bank and WHO. It supports research on infectious diseases of poverty and strengthens research capacity in disease-affected countries.

Is tropical medicine the same as parasitology?

No. Parasitology is a biological discipline organized around parasites wherever they occur; tropical medicine also covers viral, bacterial and other conditions. See What Is Parasitology?.

Who funds tropical and neglected disease research?

Mainly public agencies such as NIH/NIAID, philanthropies such as Wellcome and the Gates Foundation, and intergovernmental programmes such as WHO TDR.

What makes research ethics different in low- and middle-income settings?

The core principles are the same, but power imbalances between sponsors and host communities, adapted consent processes, double ethical review, benefit sharing and post-trial access receive particular attention.

This page is general educational information about a field of research. It is not medical advice; anyone concerned about a possible infection should consult a qualified clinician. Figures are drawn from the WHO, ASTMH, WHO TDR and Wellcome websites as of October 2026 and should be checked against current sources before citation.