WHO priority pathogens list
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| WHO priority pathogens list | |
|---|---|
| Name | World Health Organization priority pathogens list |
| Formation | 2015 |
| Type | Public health guidance |
| Headquarters | Geneva |
| Parent organization | World Health Organization |
WHO priority pathogens list
The World Health Organization convened experts to assemble a prioritized roster of infectious agents judged to pose the greatest risk of epidemic or pandemic outbreaks and to guide research and development of countermeasures. The list informs funding, [research and development] pipelines, and preparedness activities across agencies such as the Coalition for Epidemic Preparedness Innovations, Gavi, the Vaccine Alliance, and national public health institutes including the Centers for Disease Control and Prevention and the European Centre for Disease Prevention and Control. It intersects with global initiatives like the Global Health Security Agenda and the International Health Regulations (2005) while influencing manufacturers, academic consortia, and philanthropic funders.
Background and purpose
The priority pathogens list was developed by the World Health Organization in response to gaps highlighted after outbreaks such as the Ebola virus epidemic in West Africa and the SARS outbreak of 2002–2004, which exposed weaknesses in medical countermeasure pipelines and international coordination. Its purpose is to identify high-risk pathogens that lack sufficient diagnostics, vaccines, or therapeutics so that stakeholders—ranging from the Bill & Melinda Gates Foundation to national ministries like the Ministry of Health (United Kingdom) and research institutions like the Institut Pasteur—can align resources and regulatory pathways. The list also supports preparedness programs run by entities such as Médecins Sans Frontières, United Nations Children's Fund, and the Pan American Health Organization.
Criteria and methodology
WHO established a multi-criteria decision analysis framework drawing on expertise from organizations including the Country Offices of the World Health Organization, the Food and Agriculture Organization, and the World Organisation for Animal Health. Criteria considered include epidemic potential, case-fatality rate, transmissibility, human-to-human spread, societal and economic impact observed in events like the 2014–2016 Ebola outbreak in West Africa and the Zika virus epidemic in the Americas, and availability of countermeasures. Expert panels composed of virologists, bacteriologists, epidemiologists from institutions such as Johns Hopkins Bloomberg School of Public Health, University of Oxford, and the National Institute for Communicable Diseases (South Africa) applied weighted scoring to rank threats. The methodology also incorporated lessons from regulatory frameworks like the U.S. Food and Drug Administration’s emergency use pathways and the European Medicines Agency’s adaptive licensing concepts.
2017 and 2018 lists and updates
WHO published an initial priority list in 2017 and issued clarifications and adjustments in 2018 after stakeholder consultation involving the World Bank, World Health Assembly delegations, and technical partners. These updates responded to emerging evidence from outbreaks such as the Kivu Ebola epidemic and surveillance data collected by networks like the Global Influenza Surveillance and Response System. WHO coordinated follow-up workshops with research consortia at venues including the Wellcome Trust and the Rockefeller Foundation to refine research roadmaps and encourage product development partnerships.
Pathogens included and threat profiles
The list groups pathogens that pose high epidemic potential and have insufficient medical countermeasures. Examples highlighted in public WHO outputs include viral hemorrhagic fevers such as Ebola virus disease and Lassa fever, respiratory pathogens like Middle East respiratory syndrome coronavirus and novel coronavirus strains, and zoonotic agents such as Nipah virus and Rift Valley fever virus. Bacterial threats such as novel or highly resistant strains of Mycobacterium tuberculosis and polymyxin-resistant Klebsiella pneumoniae-like organisms are also prioritized when antimicrobial resistance undermines treatment options. Each pathogen profile draws on evidence from outbreaks studied by entities like the Centers for Disease Control and Prevention, genomic surveillance by laboratories such as the Wadsworth Center, and modelling work from groups at Imperial College London.
Implications for research, development, and public health preparedness
By directing attention and investment, the list influences vaccine and therapeutic pipelines in collaborations between academic developers at institutions such as the University of California, San Francisco and industry partners like multinational biopharma firms. It helps shape funding calls by organizations including the European Commission’s research programs and national research councils (for example, the National Institutes of Health). The list also informs stockpiling strategies used by agencies such as the United States Strategic National Stockpile and preparedness training conducted by World Health Organization regional offices and partner NGOs. Moreover, it encourages cross-sectoral One Health approaches promoted by the Food and Agriculture Organization and the World Organisation for Animal Health to address zoonotic spillover.
Criticisms and limitations
Critics argue the list can create narrow funding incentives that favor high-profile pathogens over neglected endemic diseases studied by institutions like the London School of Hygiene & Tropical Medicine and can underrepresent regional priorities raised by ministries in low- and middle-income countries. Others note methodological limitations when ranking heterogeneous threats and warn that static lists may lag behind fast-moving events such as the emergence of novel coronavirus variants documented by genomic consortia like GISAID. Some public health advocates emphasize the need to balance pathogen-specific countermeasures with investments in health systems strengthening championed by organizations such as Doctors Without Borders and global financing mechanisms like the Global Fund to Fight AIDS, Tuberculosis and Malaria.