Before revision:   We discuss a less detailed approach which, on the basis of the collected data  after few days from the beginning of the new phase, outlines different scenarios of the Covid-19 diffusion for longer time.
After revision:  However, in this new phase, the infection spread restarts and a quantitative analysis of the regrowth is very useful. We discuss a less detailed approach which, on the basis of the collected data after few days from the beginning of the new phase, outlines different scenarios of the Covid-19 diffusion for longer time.