Skip to main content

Table 1 Description of model parameters

From: SEIR model for COVID-19 dynamics incorporating the environment and social distancing

Model parameter name Symbol Value
Birth rate of the human population b 0.00018 days\(^{-1}\)
Natural human death rate \(\mu \) \(4.563\times 10^{-5}\) days\(^{-1}\)
Human life expectancy \(\frac{1}{\mu }\) 21915 days or 60 years
Natural death rate of pathogens in the environment \(\mu _P\) 0.1724 days\(^{-1}\)
Life expectancy of pathogens in the environment \(\frac{1}{\mu _P}\) 5.8 days
Proportion of interaction with an infectious environment \(\alpha _1\) 0.10
Proportion of interaction with an infectious individual \(\alpha _1\) 0.10
Rate of transmission from S to E due to contact with P \(\beta _1\) 0.00414
Rate of transmission from S to E due to contact with \(I_A\) and/or \(I_S\) \(\beta _2\) 0.0115
Proportion of symptomatic infectious people \(\delta \) 0.7
Progression rate from E back to S due to robust immune system \(\psi \) 0.0051
Progression rate from E to either \(I_A\) or \(I_S\) \(\omega \) 0.09
Death rate due to the coronavirus \(\sigma \) 0.0018
Rate of recovery of the symptomatic population \(\gamma _S\) 0.05 days\(^{-1}\) or \(\frac{1}{20 \text { days}}\)
Rate of recovery of the asymptomatic human population \(\gamma _A\) 0.0714 days\(^{-1}\)
Rate of virus spread to environment by symptomatic infectious individuals \(\eta _S\) 0.1 days\(^{-1}\) or \(\frac{1}{10 \text { days}}\)
Rate of virus spread to environment by asymptomatic infectious individuals \(\eta _A\) 0.05 days\(^{-1}\) or \(\frac{1}{20 \text { days}}\)