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Natural Spillover Risk and Disease Outbreaks: Is Over-Simplification Putting Public Health at Risk?

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Summary

Pandemic prevention policies rely on unproven assumptions about increasing zoonotic spillover driven by environmental change. Re-evaluating these assumptions with robust evidence is crucial for effective outbreak risk management.

Keywords:
Outbreak riskPPPRPandemic preparednessPublic health policyZoonotic spillover

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Area of Science:

  • Public Health
  • Ecology
  • Epidemiology

Background:

  • The global public health agenda is dominated by pandemic prevention, preparedness, and response (PPPR), with significant proposed funding increases.
  • Current PPPR policy is largely predicated on the assumption of escalating pandemic risk, primarily attributed to increased zoonotic spillover.
  • Proposed drivers of zoonotic spillover include anthropogenic environmental changes like deforestation and climate shifts.

Purpose of the Study:

  • To critically evaluate the evidence base supporting the assumption that zoonotic spillover is increasing due to anthropogenic environmental factors.
  • To identify oversimplifications and knowledge gaps in the current understanding of outbreak drivers.
  • To advocate for evidence-based re-evaluation of PPPR policies.

Main Methods:

  • Literature review and critical analysis of scientific reports and peer-reviewed publications supporting PPPR policy.
  • Examination of the ecological complexity underlying zoonotic spillover events.
  • Assessment of the impact of evolving pathogen detection capacities.

Main Results:

  • Many assumptions underpinning PPPR policy, particularly regarding increasing zoonotic spillover and its drivers, are not robustly supported by cited literature.
  • The relationship between environmental change and zoonotic spillover is complex and often oversimplified in policy-driven narratives.
  • Rapidly evolving pathogen detection capabilities can create a skewed perception of increasing outbreak frequency.

Conclusions:

  • Current public health policies for pandemic preparedness may be based on flawed or oversimplified assumptions.
  • A more nuanced understanding of outbreak drivers, acknowledging ecological complexity and knowledge gaps, is urgently needed.
  • Evidence-based re-evaluation is essential for developing effective and efficient interventions for managing outbreak risks.