أرسل هذا في رسالة قصيرة: Behaviours of the trajectories of infectious population of the fractional-order epidemiological model (4) by varying the fractional order, <i>ϵ</i> using the parameter values Λ = 10, <i>β</i> = 0.02, <i>α</i> = 0.01, <i>θ</i> = 0.01, <i>γ</i> = 0.6 and <i>μ</i> = 0.02, so that .