Table 1: Description of Model Parameters. The parametric values are determined based on the references [5,7,14-19].

 Model Parameter Symbol Value Rate of transmission from S to E due to contact with P β1 0.45 Rate of transmission from S to E due to contact with IA, IM and IC β2 0.75 Rate of transmission from S to E due to contact with U and H β3 0.5 Proportion of asymptomatic infectious people δA 0.75 Proportion of critical symptomatic infectious people δC 0.02 Progression rate from IA to H τA 0.02 Progression rate from IM to H τM 1 Progression rate from IC to H C 0.99 Progression rate from E to either IA, IM or IC ω 0.2 day-1 Rate of recovery from IA to R γA 0.98 Rate of recovery from H to R γH 0.97 Progression rate from H to U ξ 0.02 Progression rate from U to H φ 0.2 Progression rate from U to D λU 0.9 Progression rate from H to D λH 0.03 Progression rate from IC to D λC 0.02 Rate of virus spread to environment by IA, IM and IC η1 0.55 days-1 Rate of virus spread to environment by U and H η2 0.25 days-1 Natural death rate of pathogens in the environment µP 0.3 days-1