  In this letter we study the temporal evolution of the Sars-Cov-2 in Italy.
The time window of the real data is between February 24 and March 25. After we
upgrade the data until April 1.We perform the analysis with 4 different model
and we think that the best candidate to describe correctly the italian
situation is a generalized Logistic equation. We use two coupled differential
equations that describe the evolution of the severe infected and the deaths. We
have done this choice, because in Italy the pharyngeal swabs are made only to
severe infected and so we have no information about asymptomatic people. An
important observation is that the virus spreads between Regions with some
delay; so we suggest that a different analysis region by region would be more
sensible than that on the whole Italy. In particular the region Lombardia has a
behaviour very fast with respect to the other ones. We show the behaviour of
the total deaths and the total severe infected for Italy and five regions:
Lombardia, Emilia Romagna, Veneto, Piemonte, Toscana. Finally we do an analysis
of the peak and an estimation of how many lifes have been saved with the
LockDown.
