“…Memory effect is an essential characteristic of fractional-order derivatives which made fractional calculus and its applications widely used in many fields of science and engineering [11,12,13,14,15,16,17]. Obviously, this feature is very relevant for modeling the spread of infections [18,19,20,21,22,23,24]. For this reason, many researchers have adopted this analytical vision [25,26,27,28,29,30,31].…”