Before revision:  We find a striking relationship between the negative variation of mobility flows and the net reproduction number , in all Italian regions, between March 11th and March 18th, when the country entered the lockdown. This observation allows us to quantify the time needed to "switch off " the country mobility (one week) and the time required to bring the net reproduction number below  1 (one week).
After revision:  We find a striking relationship between the negative variation of mobility flows and the net reproduction number . We find that the time needed to "switch off " the country mobility (one week) and the time required to bring the net reproduction number below 1 (one week).