Before revision:  We propose this dynamic equation also for the describing the evolution of the number of infected people by 13 common respiratory viruses , including the COVID-19 . We have compared our theoretical predictions with the real data for Italy and Belgium and, as a benchmarking operation, also with the predictions provided by using the logistic model.
After revision:  We propose this dynamic equation also for the describing the evolution of the number of infected people by 13 common respiratory viruses , including the COVID-19 . We have compared our theoretical predictions with the real data for Italy and Belgium and, as a benchmarking operation, also with the predictions of the logistic model.