简介:Inthispaper,westudyatypeofsusceptible-exposed-infected(SEI)epidemicmodelwithvaryingpopulationsizeandintroducetherandomperturbationoftheconstantcontactrateintotheSEIepidemicmodelduetotheuniversalexistenceoffluctuations.Undersomemoderateconditions,thedensityoftheexposedandtheinfectedindividualsexponentiallyapproacheszeroalmostsurelyarederived.Furthermore,thestochasticSEIepidemicmodeladmitsastationarydistributionaroundtheendemicequilibrium,andthesolutionisergodic.Somenumericalsimulationsarecarriedouttodemonstratetheefficiencyofthemainresults.