Before revision:  Together with a physical vision of the model, this is very useful to discuss the uncertainties on the data and how they influence the reliability of calibrated model parameters and, ultimately, of model predictions.
After revision:  Together with a physical vision of the model, the present work addresses numerically the issue of parameters calibration in SIR models, it discusses the uncertainties in the data provided by international authorities, how they influence the reliability of calibrated model parameters and, ultimately, of model predictions.