Before revision:  Finally we study the behavior of the ratio infected over swabs , and we show as studying this parameter we recover the generalized Logistic model used in [1]  . We think that this trend could be useful for a future epidemic of this coronavirus.
After revision:  Finally we study the behavior of the ratio infected over swabs for Italy, Germany and USA, and we show as studying this parameter we recover the generalized Logistic model used in [1] . We think that this trend could be useful for a future epidemic of this coronavirus.