Fig. 1

Number of observed COVID-19 events by age and variant: A hospitalizations by age, B intensive care unit (ICU) admissions by age, C deaths by age, D reconstructed hospitalizations by variant, E reconstructed ICU admissions by variant, F reconstructed deaths by variant. *At the beginning of the time period, for simplification purposes, all cases were attributed to the Alpha variant although the historical strain was still circulating (see Additional file 1: Text S2)