History20th centuryglobalhigh confidence

The 1957 H2N2 influenza pandemic caused about 1.1 million deaths globally.

Notes on verification

Figure matches Viboud et al. 2016 (Journal of Infectious Diseases) peer-reviewed estimate, corroborated by Smithsonian, History.com, CDC, and Yale Insights. Other sources cite broader ranges (1-2M, 1-4M) due to differing methodologies, but the specific 1.1 million figure is precisely sourced.

Sources