Figure 3

Effective reproduction number of all infections and severe cases in Tokyo metropolitan area compared to the model result. The effective reproduction number is plotted with a delay of 14 and 26 days for all and severe cases, respectively. Parameter fitting is done in the span \(200\le t < 500\). ‘Model’ indicates the prediction from human mobility alone, ‘Model +\(\,\delta\)’ includes the effect of the Delta variant, and ‘Model + \(\delta\) + V’ additionally includes the effect of the vaccination.