Fast spread of COVID-19 in Europe and the US and its implications: even modest public health goals require comprehensive intervention
Ke, R.; Sanche, S.; Romero-Severson, E.; Hengartner, N.
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AbstratThe COVID-19 pandemic caused more than 800,000 infections and 40,000 deaths by the end of March 2020. However, some of the basic epidemiological parameters, such as the exponential epidemic growth rate and R0 are debated. We developed an inference approach to control for confounding factors in data collection, such as underreporting and changes in surveillance intensities, and fitted a mathematical model to infection and death count data collected from eight European countries and the US. In all countries, the early epidemic grew exponentially at rates between 0.19-0.29/day (epidemic doubling times between 2.4-3.7 days). This suggests a highly infectious virus with an R0 likely between 4.0 and 7.1. We show that similar levels of intervention efforts are needed, no matter the goal is mitigation or containment. Early, strong and comprehensive intervention efforts to achieve greater than 74-86% reduction in transmission are necessary. One-sentence SummaryWe estimated that COVID-19 spreads rapidly in 8 European countries and the US, suggesting that early, strong and comprehensive interventions are necessary.
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