A major global study released on February 23, 2020, warns that the risk of future pandemics is rising and calls for substantial investment in preparedness, surveillance, and the strengthening of health systems worldwide to mitigate that risk. The research, conducted by an international consortium of epidemiologists, veterinarians, ecologists, economists, and public health experts, and published simultaneously in peer-reviewed form and as a summary for policymakers, concludes that the combination of ecological change, population dynamics, and the globalised nature of modern society has produced conditions in which serious infectious disease events are becoming more likely, more frequent, and potentially more severe.

The study reviews evidence from recent decades, draws on detailed modelling of specific disease emergence scenarios, and synthesises findings from a wide range of scientific disciplines. Its central conclusion is not that a specific pandemic is imminent — the researchers have been careful to avoid that kind of claim — but that the underlying drivers of pandemic risk have been intensifying and that the current level of global preparedness, while improved in some respects over the past two decades, remains inadequate to the scale of the challenge. The study's release has been timed to inform ongoing international discussions about pandemic preparedness that have been gathering momentum in recent years.

The Drivers of Rising Risk

The study identifies several interacting drivers of rising pandemic risk. Land-use change — including deforestation, agricultural expansion, and the conversion of natural habitats for human use — has been bringing people and domestic animals into closer contact with wildlife, including species that can harbour pathogens capable of infecting humans. The more frequent such contact becomes, the greater the likelihood that pathogens will cross the species barrier, and once they have done so, the risk of onward transmission within human populations depends on a range of further factors.

Intensive livestock production, particularly where it operates on a large scale in close proximity to wildlife habitat or with limited biosecurity, has been identified as a specific area of concern. Specific livestock systems have been implicated in the emergence of particular pathogens in the past, and the broader trend toward more intensive production has expanded the surface at which potential spillover events can occur.

Global travel and trade, while central to the modern economy and to human connection, also serve as channels through which emerging pathogens can spread quickly once they have established transmission in humans. The world's aviation network, in particular, is capable of moving a pathogen between continents within hours, a reality that fundamentally changes the dynamics of outbreak containment compared with earlier eras.

Urbanisation and population density produce conditions in which respiratory and other close-contact infections can spread rapidly. Many of the world's most populous cities are located in regions where surveillance capacity, health system capacity, and specific preparedness measures vary significantly, and where the density of urban populations creates inherent vulnerability to pathogens that can exploit it.

Climate change is contributing additional pressures. Shifts in the range and behaviour of disease vectors, changes in ecological relationships that affect the dynamics of specific diseases, and the cumulative effect of climate-driven displacement on human populations all interact with pandemic risk in ways that the study explores in detail.

The State of Preparedness

The study's assessment of current preparedness is sobering but not uniformly pessimistic. Specific investments over the past two decades — including in global disease surveillance networks, in laboratory capacity, in international frameworks such as the International Health Regulations, and in specific response infrastructures — have produced meaningful improvements in the global capacity to detect and respond to infectious disease events. Several recent episodes, including outbreaks of specific diseases that might have escalated significantly but did not, have demonstrated that the system has genuine strengths.

At the same time, the study identifies significant and specific gaps. Laboratory capacity in many regions remains below the levels required for rapid identification of novel pathogens. Surveillance systems that depend on reporting from health facilities are only as effective as the health facilities themselves, and in contexts where primary health care is weak, pathogens can circulate for extended periods before being identified. Workforces capable of responding rapidly to outbreaks — including specific roles such as epidemiologists, infection prevention specialists, and biosafety professionals — are in short supply relative to potential need. And specific technologies and tools — including rapid diagnostic platforms, broad-spectrum antivirals, and vaccine platforms that can be adapted quickly to novel pathogens — have been developed to varying stages but have not been deployed at the scale or in the distribution that effective response might require.

Funding for pandemic preparedness has been a recurring issue. International commitments to specific preparedness activities have sometimes fallen short of announced amounts, and the more general challenge of sustaining investment in activities whose benefits are most visible in their absence — preparedness that prevents outbreaks from escalating into visible crises — has complicated the political economy of the field.

Health systems in many parts of the world — including in high-income countries — have been operating with limited reserve capacity. The pressures of day-to-day demand have left many systems with little margin to absorb the additional load that a major outbreak would produce, and the workforce pressures that have been visible in many health systems in recent years have eroded another potential source of resilience.

What a Pandemic Could Look Like

The study includes detailed scenarios modelling what different kinds of pandemic could look like under current conditions. These scenarios — which the authors describe as illustrative rather than predictive — explore pandemics caused by respiratory pathogens of varying transmissibility and severity, by pathogens transmitted through different routes, and by pathogens with different profiles of clinical manifestation. The scenarios also explore different response trajectories, including scenarios in which early detection and rapid response contain the outbreak, scenarios in which response is delayed or fragmented, and intermediate scenarios in which the pathogen spreads but is eventually brought under control.

The lessons drawn from these scenarios are consistent. Early detection and rapid response are critical. Health system capacity — including both the specific capabilities required to manage outbreak-related patients and the general capacity to maintain other essential services during an outbreak — is a major determinant of outcomes. Social and economic effects of pandemics are substantial even in relatively well-contained scenarios, and can be catastrophic in scenarios where containment fails. International cooperation — on information sharing, on distribution of vaccines and treatments, on coordinated policy measures — makes a significant difference to outcomes both for individual countries and globally.

The scenarios also highlight the disproportionate impact of pandemics on populations with specific vulnerabilities, including people with chronic health conditions, older adults, displaced people, and populations in regions with weaker health systems. Inequities that exist before a pandemic tend to be amplified during and after one, and specific attention to these populations has been identified as a critical element of effective response.

What the Study Recommends

The study includes a detailed set of recommendations directed at governments, international organisations, private-sector actors, research institutions, and civil society. The recommendations range from specific technical investments to broader policy and institutional commitments, and they are designed to be implementable across a range of political and economic contexts.

Investment in surveillance — including both traditional health-facility-based surveillance and newer approaches drawing on genomic sequencing, wastewater monitoring, and animal health data — is identified as a critical priority. The cost of expanded surveillance is modest relative to the potential benefits, and the technologies required are already available; what is needed is the sustained commitment to deploy them.

Strengthening of health system capacity — in terms of workforce, infrastructure, supplies, and management — is identified as a foundational element of pandemic preparedness. Health systems that are robust in their ordinary operations are much more capable of absorbing the additional demands of an outbreak, and investments in general health system strengthening therefore produce benefits both for everyday care and for pandemic preparedness specifically.

Research and development for medical countermeasures — including vaccines, therapeutics, and diagnostics — requires sustained funding and attention. Specific platforms that allow for rapid development of new products in response to emerging threats have shown promise and deserve continued investment. Equitable access to the products that result has been identified as a specific policy challenge, with past experience showing that inequities can produce both humanitarian and epidemiological consequences.

International frameworks — including the International Health Regulations, specific agreements on pandemic preparedness, and coordination mechanisms across UN agencies — require continued support and, in some respects, reform. The study calls for specific strengthening of legal and financial instruments that allow the international community to respond more effectively to events that cross borders.

At the community level, the study highlights the importance of engagement, communication, and trust. Pandemic response depends on public cooperation, and public cooperation depends in turn on trust in institutions, on effective communication, and on the meaningful participation of communities in the planning and implementation of measures that affect them.

Political and Economic Dimensions

The political and economic dimensions of pandemic preparedness have received increasing attention, and today's study engages with them directly. The benefits of preparedness tend to be diffuse and in many cases invisible — the outbreaks that do not escalate, the lives that are not lost, the economic disruptions that do not occur — while the costs are specific and visible. This asymmetry makes preparedness politically vulnerable, and the study argues for institutional mechanisms that can sustain commitment across political cycles and economic conditions.

Economic analyses cited in the study suggest that the returns on investment in preparedness are significantly positive, with avoided costs of pandemics far exceeding the cost of effective preparedness in expected-value terms. Specific investments that pay dividends across multiple threats — including health system strengthening, workforce development, and research infrastructure — have particularly favourable returns. The challenge, the authors note, is to translate these analyses into sustained political and budgetary commitments.

Looking Ahead

The study does not predict a specific pandemic, but it does argue that the underlying conditions for one are becoming increasingly permissive. That argument is made on the basis of evidence from ecology, from epidemiology, from travel patterns, from urbanisation trends, and from detailed analyses of specific recent events. It is not a new argument in broad outline, but today's study presents it with more evidence, more specificity, and more operational detail than previous assessments.

The recommendations that accompany the analysis are, in many cases, also not new. What the study adds is a renewed case for taking them seriously and implementing them at the scale required. Whether that case will be heard — by governments, by international organisations, by private-sector actors, and by publics — will determine whether the rising risk identified in the study translates into actual outcomes that could have been prevented.

For the research community, today's study provides a comprehensive reference document that will inform further work in pandemic preparedness for years to come. For policymakers, it provides a framework for thinking about the choices they will need to make. For the public, it provides a clear, measured explanation of what is at stake and what can be done about it.

A Measured Warning

The tone of today's release has been deliberately measured. The study's authors have been clear that they are not forecasting a specific crisis and that they are not arguing for particular responses in a spirit of alarm. Their argument is quieter and, in its way, more difficult to ignore: that the analytical evidence for rising pandemic risk is robust, that the tools available to reduce that risk are known and largely ready to be deployed, and that the gap between risk and preparedness is a gap that decisions taken now can materially narrow.

Whether that gap will be narrowed is, ultimately, a question not for researchers but for decision-makers, and not only for decision-makers at the top of governments and international organisations but also for those operating in specific health systems, research institutions, and communities around the world. The study's authors have made their contribution. What happens next depends on those who will read it.