Table 1.

Model Parameter Setting

Variables	Value
Input
Population	8,146
Number of susceptible individuals	8,142
Number of exposed individuals	0
Number of infected individuals	4
Number of removed individuals	0
Latent period, $D_e$	$D_e\sim N\left(\mathrm{3,1}\right)$
Infectious period, $D_i$	$D_i\sim N(\mathrm{8,2}$)
The contact infected rate,$\theta$ (without age differences)	8‰ (R 0 = 2), 12‰ (R 0 = 3), 16‰ (R 0 = 4)
The contact infected rate,$\theta$ by age groups	See Table 2
Output
Attack rate (%)	/
Herd immunity (%)	/
The effective reproduction number, Rt	/
Durations (day)	/

Note. Attack rate means the proportion of those experiencing infection at the end of an epidemic; Herd immunity equals to attack rate when spreading naturally; Durations is the time that the epidemic lasts.