The Spillover Surveillance Gap: 1.7 Million Unknown Pathogens in Wildlife, 5% Sampled, and the Pandemic Prevention Infrastructure Deficit
Problem Definition
The next pandemic is likely already circulating in wildlife and potentially in early human transmission chains, undetected because only 5% of the zoonotic pathogen reservoir has been sampled. 2M spillover events occur annually.
The surveillance infrastructure to detect spillovers at the source is catastrophically inadequate: Sub-Saharan Africa, home to 60% of recent spillover events, has <3% of global genomic sequencing capacity. Spillover hotspots (tropical forests, wet markets, wildlife trade) are in low-income regions with the weakest surveillance.
A pathogen could reach pandemic scale in weeks before geographic surveillance gaps allow detection. COVID-19 was detected relatively early due to multiple lucky circumstances (moderate severity causing healthcare seeking, high transmissibility creating case clusters, competent epidemiologists). The next pathogen might not be as detectable.
Root Causes
Geographic mismatch between spillover risk and surveillance infrastructure
Surveillance is biased toward detection at epidemic scale, not spillover scale
Financing gap between pandemic prevention need and available resources
Perverse incentives in disease reporting