Table 3. Model variables.

Subscripts i denote the ith age group, superscripts the vaccination status (unvaccinated, immunized by one dose, by two doses).

Variable	Meaning	Units	Explanation
$S_i,S_i^1,S_i^2$	Susceptible pools	people	Non-infected people that may acquire the virus.
$V_i^0,V_i^1$	Vaccinated pools	people	Non-infected people that have been vaccinated but have not developed antibodies yet, thus may acquire the virus.
$E_i,E_i^1,E_i^2$	Exposed pools	people	Infected people in latent period. Cannot spread the virus.
$I_i,I_i^1,I_i^2$	Infectious pools	people	Currently infectious people.
${\text{ICU}}_i,{\text{ICU}}_i^1,{\text{ICU}}_i^2$	ICU pools	people	Infected people receiving ICU treatment, isolated.
$D_i,D_i^1,D_i^2$	Dead pools	people	Dead people.
$R_i,R_i^1,R_i^2$	Recovered pools	people	Recovered/immune people that have acquired post-infection or sterilizing vaccination immunity.
${\widehat{N}}^{\text{obs}}$	Observed new infections	people day−1	Daily new infections, including reporting delays. Eq (42)
${\widehat{R}}_t^{\text{obs}}$	Observed reproduction number	–	The reproduction number that can be estimated only from the observed cases: ${\widehat{R}}_t^{\text{obs}}={\widehat{N}}^{\text{obs}}\left(t\right)/{\widehat{N}}^{\text{obs}}(t-4)$.