摘要：A nonautonomous SIR epidemic model with age structure is studied. Using integro-differential equation and a fixed point theorem, we prove the existence and uniqueness of a positive solution to this model. We conclude our results and discuss some problems to this model in the future. We simulate our analyzed results.
关键词：Compact Support ; Epidemic Model ; Positive Period Solution ; Integral Differential Equation ; Nonnegative Measurable Function
