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Epidemiological Models With Parametric Heterogeneity : Deterministic Theory for Closed Populations

Published online by Cambridge University Press:  06 June 2012

A.S. Novozhilov*
Affiliation:
Applied Mathematics–1, Moscow State University of Railway Engineering Obraztsova 9, bldg. 9, Moscow 127994, Russia
*
Corresponding author. E-mail: anovozhilov@gmail.com
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Abstract

We present a unified mathematical approach to epidemiological models with parametric heterogeneity, i.e., to the models that describe individuals in the population as having specific parameter (trait) values that vary from one individuals to another. This is a natural framework to model, e.g., heterogeneity in susceptibility or infectivity of individuals. We review, along with the necessary theory, the results obtained using the discussed approach. In particular, we formulate and analyze an SIR model with distributed susceptibility and infectivity, showing that the epidemiological models for closed populations are well suited to the suggested framework. A number of known results from the literature is derived, including the final epidemic size equation for an SIR model with distributed susceptibility. It is proved that the bottom up approach of the theory of heterogeneous populations with parametric heterogeneity allows to infer the population level description, which was previously used without a firm mechanistic basis; in particular, the power law transmission function is shown to be a consequence of the initial gamma distributed susceptibility and infectivity. We discuss how the general theory can be applied to the modeling goals to include the heterogeneous contact population structure and provide analysis of an SI model with heterogeneous contacts. We conclude with a number of open questions and promising directions, where the theory of heterogeneous populations can lead to important simplifications and generalizations.

Type
Research Article
Copyright
© EDP Sciences, 2012

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