天花是人类独有的高传染率的疾病。
第二章，提出了具有年龄结构和周期传染率的的SIS模型。
In chapter 2, We study a nonautonomous SIS model with age structure.
研究如下一类具有标准发生率的SI型传染病模型。
An SI epidemic model with standard incidence rate as follow is investigated.
这同样是一种传染性很强的病毒，并切有较高的致死率。
This is also a highly infectious virus and has a high fatality rate.
这同样是一种传染性很强的病毒，并切有较高的致死率。
This is also a highly infectious virus and has a high fatality rate.
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