Fig. 2.

Fitting result between the simulated number and the monthly reported cases of hand, foot and mouth disease in China, 2015–2018. The observed number of HFMD cases comes from official infectious disease report from China CDC, the fitting number of HFMD cases is the sum of I₂ and I₃, where I₂ indicates the number of no EV71 or CVA16 HFMD $({\mathrm{I}}_{\mathrm{h}}^{-\mathrm{ec}}$) / no EV71 HFMD $\left({\mathrm{I}}_{\mathrm{h}}^{-\mathrm{e}}\right)$, I₃ indicates the number of EV71 or CVA16 HFMD $\left({\mathrm{I}}_{\mathrm{h}}^{\mathrm{ec}}\right)$ / only EV71- HFMD $\left({\mathrm{I}}_{\mathrm{h}}^{\mathrm{e}}\right)$