Table 1. Variables of the model. Index i indicates the cohort (normally student grade) and d the day of infection (running from 1 to 9, or 32 for influenza and COVID-19, respectively).

Variable	Interpretation
Si	Naïve persons in cohort i (for immunity, $\widetilde{S_i}\left(0\right)=S_i\left(0\right)(1-v{v}_e)$, where v is the fraction vaccinated and ve is the vaccine efficacy
Ii,d	Infected persons in cohort i on day d of infection who are not isolated
Hi,d	Similarly, but who are isolated (e.g., at home)
Ri	Recovered in cohort i