Compartment | Description |
---|---|
\(S\) | Susceptible individuals |
\(E\) | Exposed individuals (infected but not infectious) |
\(A\) | Asymptomatic infected persons with infectious ability |
\(I\) | Symptomatic infected persons with infectious ability |
\(R\) | Recovered individuals, get antibodies after recovery |
\(V\) | Vaccinated individuals, finished the whole course of COVID-19 vaccination but some did not produce antibodies, still susceptible |
\({S}_{q}\) | Quarantined susceptible individuals, close contacts who are not actually infected and will not be infected during the quarantine period |
\({V}_{q}\) | Quarantined vaccinated individuals, close contacts who are vaccinated and are not actually infected, will not be infected during quarantine |
\({E}_{q}\) | Quarantined exposed individuals, close contacts who are infected but not yet infectious, will be identified through close contact tracing of the infected person and admitted to hospital after testing positive |
\(H\) | Hospitalized individuals, infected person (whether asymptomatic or not) admitted to hospital after being detected |
\(P\) | Viruses in the environment, excreted by undetected infected individuals, can infect susceptible individuals and vaccinated individuals who have not produced antibodies |