Stability Analysis of an SEIR Model with Treatment

摘要

We study the dynamics of a SEIR epidemic model with nonlinear treatment function,thattakesintoaccountthelimitedavailabilityofresourcesincommunity.Undersome conditionsweprovetheexistenceoftwopossibleequilibria:thedisease-freeequilibriumand the endemic equilibrium. Using Lyapunov’s method and Li’s geometrical approach, We also show that the reproduction numbere???0is a threshold parameter: the disease-free equilibrium is globally asymptotically stable when the basic reproduction number is less than unity and theuniqueendemicequilibriumisgloballyasymptoticallystablewhenthebasicreproduction number is greater than this critical value. In the end, we give some concluding remarks concerningtheroleoftreatmentontheepidemicpropagation.