Visualizing COVID-19’s Rt

Effective Rt

The effective reproduction number (Rt) characterizes the COVID-19 spread rate, defined as the average number of secondary infectious cases produced by a primary infectious case. It’s used to define the potential for spread at a specific time. If Rt > 1, the virus will spread out and the disease will become an epidemic; if Rt = 1, the virus will spread locally and the disease is endemic; if Rt < 1, the virus will stop spreading and the disease will disappear eventually.

INTERACTIVE MAP: covid19-analysis.org

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