Parameters/Variables

Description

S

Individuals who are susceptible

E

Individuals who are exposed (newly infected but not infectious)

I_s

Individuals who have developed symptoms and are infectious

I_a

Individuals who are asymptomatic

H

Individuals who are admitted in hospital with the disease

Q

Individuals who are infectious and are quarantined

R

Individuals who recover from the disease

Θ

Recruitment rate

${\rho }_s$

Contact rate with the symptomatic class

${\rho }_a$

Contact rate with the asymptomatic class

$\kappa$

Fraction of individuals who use face masks

$\omega$

Expected decrease in the risk of infection as a result of using face masks

$\sigma$

Progression rate of the exposed to the infectious classes

q

Fraction of the exposed who showed no symptoms

$\left(1-q\right)$

Fraction of the exposed who showed symptoms

$\pi$

Progression rate of the symptomatic to hospital

$\gamma$

Quarantine rate of the symptomatic

$\xi$

Recovery rate of the symptomatic

$\tau$

Recovery rate of the asymptomatic

$\epsilon$

Progression rate of the quarantined to the hospital

$\nu$

Recovery rate of the quarantined

$\beta$

Recovery rate of the hospitalized

$\delta$

The natural death rate

${\alpha }_1\mathrm{,}{\alpha }_2\mathrm{,}{\alpha }_3\mathrm{,}{\alpha }_4$

The disease induced death rates for the symptomatic, hospitalized, Asymptomatic and quarantined individuals respectively