“…The main reasons for using a fractional-order system (FDE) is related to systems with memory, history, or nonlocal effects which exist in many biological systems that show the realistic biphasic decline behavior of infection or diseases but at a slower rate. It has been studied by many researchers that fractional extensions of mathematical models of integer order represent the natural fact in a very systematic way such as in the approach of Etemad et al [13][14][15], Hedayati et al [13,[16][17][18][19], Baleanu et al [11,18,20,21], and Mahdy et al [22,23]. In recent years, many papers have been published on the subject of Caputo-Fabrizio fractional derivative (see, for example, [24][25][26][27][28][29][30]).…”