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Persistence in some periodic epidemic models with infection age or constant periods of infection

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  • Much recent work has focused on persistence for epidemic models with periodic coefficients. But the case where the infected compartments satisfy a delay differential equation or a partial differential equation does not seem to have been considered so far. The purpose of this paper is to provide a framework for proving persistence in such a case. Some examples are presented, such as a periodic SIR model structured by time since infection and a periodic SIS delay model.
    Mathematics Subject Classification: Primary: 92D30, 45J05; Secondary: 54H20.


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