Fig. 3.

Sequential effective reproductive numbers (R(t)) for Wuhan’s epidemic trend estimated based on dynamics models. R(t) curves were estimated based on Model I using actual data from before February 14 (red curve), Model II by refitting the trend after February 14 (blue curve), and calibrated actual frequencies (orange curve). Three vertical bars denote the three key intervention periods: first-round universal symptom survey, clinical diagnostic criteria, and second-round universal symptom survey.