Fig. 1

Diagram showing the model’s stages and transitions. The figure shows a block diagram with all the model’s states, namely, susceptible (S), vaccinated (V), vaccination failure (FV), exposed to the virus (E), which here is assumed to mean infected but not yet symptomatic, yet potentially still infectious, asymptomatic (A), infected and infectious (I), hospitalized (H), ICU patients (G) and recovered from infection (R). Transitions from one compartment to other are represented as rates, as described in the main text