Fig. 4.
(A) Observed daily Covid-19 cases for the United States and each US state. Note that the time origin is Feb. 15, 2020, and 7 d moving average is taken for each US state. (B) Simulated Covid-19 cases using the kernel-based SIR model, taking into account the multiphase population release. Here, we selected daily confirmed cases reported in the United States, New Jersey, California, and Colorado as representative scenarios showing two peaks occurring before and after the reopening, with a single peak occurring before the reopening, a single peak occurring after the reopening, and multiple peaks, respectively. Note that the model acceptably reproduces the US Covid-19 cases. (C) Values of Rb used for the simulations. (D) Calibrated piecewise linear function Fs.