Both H1N1 and COVID-19 spread through U.S. cities faster than early warning systems could keep up. Credit: Shutterstock Public health scientists at the Columbia University Mailman School of Public Health used advanced computer simulations to trace how the 2009 H1N1 flu pandemic and the 2020 COVID-19 pandemic spread across the United States. Their results show how quickly respiratory pandemics can expand and why stopping them early is so challenging. Published in the journal Proceedings of the

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