Abstract
This chapter deals with the modeling of epidemics with demographic age-structure. Apart from the dramatic family scenario described by Lucretius, showing that a disease such as the plague does not distinguish among ages, the importance of considering the age of the individuals in an epidemic model arises from the fact that, for many diseases, the rate of infection varies significantly with age.
Praeterea iam pastor et armentarius omnis
et robustus item curvi moderator aratri
languebat, penitusque casa contrusa iacebant
corpora paupertate et morbo dedita morti.
Exanimis pueris super examinata parentum
corpora nonnumquam posses retroque videre
matribus et patribus natos super edere vitam.
Lucretius, “De Rerum Natura”, Liber VI, 1252–1258
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Notes
- 1.
Moreover, by now the shepherd and every herdsman, and likewise the sturdy steersman of the curving plough, would fall drooping, and their bodies would lie thrust together in the recess of a hut, given over to death by poverty and disease. On lifeless children you might often have seen the lifeless bodies of parents, and again, children breathing out their life upon mothers and fathers.
- 2.
Note that if J is constant, i.e. J(t) ≡ J, then Ψ(a, t, a; J) = ψ(a, J).
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Iannelli, M., Milner, F. (2017). Epidemics and Demography. In: The Basic Approach to Age-Structured Population Dynamics. Lecture Notes on Mathematical Modelling in the Life Sciences. Springer, Dordrecht. https://doi.org/10.1007/978-94-024-1146-1_10
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