COVID-19 Growth Curves For March 30, 2020

This figure shows the recent growth in the number of confirmed COVID-19 cases for several US states, using data through Monday 30 March. Dashed lines show exponential growth curves, labeled by doubling time in days. Many states now seem to be seeing a slight reduction in their exponential growth rates, as recent data points drop below the dashed lines showing their growth over the past two weeks. This is very good news. But the disease is still spreading, as new cases appear everywhere. The growth in New York now has a doubling time even longer than 4 days. Its earlier rapid growth with 1.4-day doubling may have been an effect of rapid expansion in testing, rather than actual spread of the disease. Data are from several sources: from state reports (for New Mexico and Colorado), from https://ncov2019.live/data, from the Johns Hopkins U. GitHub repository https://github.com/CSSEGISandData/COVID-19, and from https://github.com/COVID19Tracking/covid-tracking-data. Created by Nels Hoffman

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