Copyright © 2010 Junyuan Yang and Xiaoyan Wang. This is an open access article distributed under the
Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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.