“…Recently, fractional derivatives have been used to describe epidemiological models and they have proven to be more accurate in some cases, when compared to the classical ones. We find in the literature different models described by fractional derivatives, like the SIR model [6,7,21,24,47,50,60,61], the SIR model with vaccination [17,36,58], the SIRC model [17], the SEIR model [23,51], the MSEIR model [8], etc. We also refer some applications to biomedical modelling [11,29,44,45,48].…”