Surveillance data.

In total 8 different datasets were included in this study; confirmed COVID-19 cases, hospitalization and deaths for Germany and France, as well as confirmed Influenza cases and confirmed hospitalizations due to severe acute respiratory infections (SARI). The COVID-19 datasets are available on both country- and regional level, which results in 16 (regional) + 1 (country) time series for each of the German datasets and in 13 (region) + 1 (country) for each of the French datasets. All datasets were split into N training and evaluation windows. Details are explained in section 2.4.