How COVID and H1N1 swept through U.S. cities in just weeks

New simulations reveal that both H1N1 and COVID-19 spread across U.S. cities in a matter of weeks, often before officials realized what was happening. Major travel hubs helped drive rapid nationwide transmission, with air travel playing a bigger role than daily commuting. Unpredictable transmission patterns made real-time forecasting especially difficult. The study highlights why early detection systems are critical for slowing future pandemics.

www.sciencedaily.com/releases/2026/02/260207092906.htm

STUDY - PNAS - Reconstructing the early spatial spread of pandemic respiratory viruses in the United States - https://www.pnas.org/doi/10.1073/pnas.2518051123

How COVID and H1N1 swept through U.S. cities in just weeks

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