Before revision:  Although the model is relatively simple, the comparison with the public data show that the analytical solution of the model (with the correctly-specified parameters) leads to the results, which are in good agreement with the measured data  .
After revision:  Although the model is relatively simple, the comparison with the public data show that the analytical solution of the model (with the correctly-specified parameters) leads to the results, which are in good agreement with the measured data . Prediction of the total number of the COVID-19 cases is discussed and an example is presented using the measured data in Austria .