Table 1.

The description of COVID-19 model state variables.

State variable	Description
S(t)	class of individuals susceptible to COVID-19 disease
E(t)	class of individuals exposed to COVID-19 (pre-symptomatically infected individuals)
V(t)	class of individuals vaccinated from COVID-19
$I_u(t)$	class of undetected infectives (majorly asymptomatic infectives)
$I_I(t)$	class of isolated infectives (includes both symptomatic and asymptomatic infectives)
$I_h(t)$	class of hospitalized infectives (those who requires intensive health care)
$R_u(t)$	class of unknown recovered individuals
$R_k(t)$	class of known recovered individuals
D(t)	class of individuals died from COVID-19