Fig. 1
Daily confirmed cases of COVID-19 in Italy, from January 22, 2020 until April 13, 2021. Red dots correspond to dates that, according to the Epidemic Volatility Index (EVI), an early warning was issued indicating that a rise in the COVID-19 cases is expected. Data are presented on the original scale (1a) and the logarithmic scale (1b), which facilitates the comparison of the steepness of the epidemic curve between the different waves.