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1、-一类传染病模型的稳定性分析宋贽,惠淑荣基金项目:沈阳农业大学青年教师科研基金资助项目(20081021)作者简介:宋贽(1982-),女,沈阳农业大学助教,硕士,从事微分方程定性和分支理论的研究。通讯作者Correspondingauthor:惠淑荣(1963-),女,沈阳农业大学教授,硕士,从事数学分析和应用数学研究。,陶桂洪(沈阳农业大学理学院,沈阳110866)摘要:近年来研究发现,染病者不同个体病毒水平差异很大,传染力也不同。如果疾病传播与传染力相关,其差异可以帮助解释疾病传播中某些费解现象,并且正是由于这种差异,一小部分染病者个体可能是疾病传播的主要因素,因此,本文
2、建立一个传染病模型来研究传染力不同对疾病的影响,应用现代数学中的微分方程理论和非线性动力学的方法,得到了疾病传播的基本再生数,并进行了模拟仿真。关键词:传染病模型;全局稳定性;基本再生数;阈值StabilityAnalysisforanEpidemicModelSONGZhi,HUIShu-rong*,TAOGui-hong(CollegeofScience,ShenyangAgriculturalUniversity,Shenyang110866,China)Abstract:Recentstudiesininfectedindividualsshowthatvirallev
3、elsvarywidelybetweenindividuals.Ifinfectionsarecorrelatedwithinfectiousness,thesevariationsexplainpuzzlingresultsfrominfectionstransmissionstudiesandsuggestthatasmallsubsetofinfectedpeoplemayberesponsibleforadisproportionatenumberofinfections,therefore,weuseamodeltostudytheimpactofvariations
4、ininfectiousness,applyingordinaryequationtheoryandnonlineardynamicsmethods,wederivethereproductivenumber,andcarryoutnumericalsimulations.Keywords:epidemicmodel;GlobalStability;Reproductivenumber;ThresholdConventionalepidemicmodelsmostlyassumethatallsusceptibles,infectivesareequivalent,withou
5、tdistinction,Infact,thisassumptionestablishesonlywhentimeisshort,closedenvironment,forstudiesonpathogenesisofinfectiousdiseasesforalongtime,largescaledoesnotapply,morerecentresearchmodelsbecomemorelikeactual,isdividedintotwomainareas:consideredassusceptibleofdifferenttypesofindividualhealth,
6、growth,environment,andsodifferent,possibilityofcontactwithinfectedpatientswereinfectedwiththediseaseisdifferent,youcanfurtherimmunesusceptibledividedinton,accordingtotheirdegreeofsusceptibilityofdifferentgroupsofsusceptible,denoted,thatmodel[1];Similarly,consideredinfectedindividualsduetothe
7、irimmunesystem,such.---asinvivocharacteristicsanddifferencesoftheenvironment,abilitytospreadofdiseaseisdifferent,soinfectivescanbefurtherdividedintonsub-groups,denotedthatmodel[2-4],文献[2-4]主要针对艾滋病建立了传染病模型,本文在此基础上,推广到一般的传染病,并考虑康复的病人可再次被感染,得到了无病平衡点全局