Fewer Epidemics, No Fewer Deaths: Global Trends in Epidemic Frequency and Mortality, 2000–2025—Evidence from the Emergency Events Database (EM-DAT)

Background/Objectives: Epidemic infectious diseases remain a persistent global threat, but whether declining outbreak frequency translates into reduced mortality is unclear. This gap is critical for emergency care systems, where timely intervention determines survival. This study aims to characterize global epidemic trends and to assess whether reductions in outbreak frequency have been accompanied by reductions in epidemic mortality. Methods: We performed a retrospective global analysis of epidemic infectious disease events recorded in the Emergency Events Database (EM-DAT) from 2000 to 2025, following the STROBE reporting guideline. Data on disease type, geographic distribution, deaths, and affected populations were extracted. Completeness of mortality and affected-population reporting was quantified by region and disease type. Crude mortality ratios (CMRs) were compared across regions and pathogens using Kruskal–Wallis tests, and temporal trends were assessed with Mann–Kendall analysis and Sen’s slope estimation. Results: We identified 893 epidemic events across 131 countries, resulting in 125,262 deaths and over 12.7 million affected individuals. Mortality data were available for 773 events (86.6%), with completeness ranging from 92.0% in Africa to 23.5% in Europe. Burden was overwhelmingly concentrated in sub-Saharan Africa, which accounted for 80.2% of deaths. Cholera was the most frequent pathogen, while Ebola showed extreme lethality (CMR 42.71%). Despite a significant decline in annual epidemic frequency (τ = −0.668, p < 0.001), the greater part of which preceded the COVID-19 pandemic, neither annual mortality (τ = −0.237, p = 0.094) nor the annual mortality ratio (τ = −0.114, p = 0.427) showed a commensurate decline. Marked heterogeneity across regions and diseases underscores the dominant role of healthcare system capacity. Conclusions: Global progress in reducing epidemic frequency has not been matched by gains in survival. The persistence of high mortality in regions with constrained emergency care capacity highlights a critical failure in translating outbreak control into lives saved. Strengthening emergency care systems, improving access to timely treatment, and addressing structural inequities are essential. Fewer epidemics are not enough; fewer deaths when they occur is what is needed.