Fig. 6

Comparison of scenarios with different contact rates. The abscissa axis is the time. The blue solid line is the case with no changes (q1=exp(−δT(t))); The purple dash line is the case with q1=0.2; The red dash-dot line is the case with q1=0.5. a–b Adjust the contact rate from 5 March 2020; c–d Adjust the contact rate from 20 March 2020