# The final size of an epidemic and its relation to the basic reproduction number

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### Resumé

We study the final size equation for an epidemic in a subdivided population with general mixing patterns among subgroups. The equation is determined by a matrix with the same spectrum as the next generation matrix and it exhibits a threshold controlled by the common dominant eigenvalue, the basic reproduction number R00: There is a unique positive solution giving the size of the epidemic if and only if R00 exceeds unity. When mixing heterogeneities arise only from variation in contact rates and proportionate mixing, the final size of the epidemic in a heterogeneously mixing population is always smaller than that in a homogeneously mixing population with the same basic reproduction number R00. For other mixing patterns, the relation may be reversed.
Originalsprog Engelsk Bulletin of Mathematical Biology 73 10 2305-2321 17 0092-8240 https://doi.org/10.1007/s11538-010-9623-3 Udgivet - 2011

### Citer dette

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title = "The final size of an epidemic and its relation to the basic reproduction number",
abstract = "We study the final size equation for an epidemic in a subdivided population with general mixing patterns among subgroups. The equation is determined by a matrix with the same spectrum as the next generation matrix and it exhibits a threshold controlled by the common dominant eigenvalue, the basic reproduction number R00: There is a unique positive solution giving the size of the epidemic if and only if R00 exceeds unity. When mixing heterogeneities arise only from variation in contact rates and proportionate mixing, the final size of the epidemic in a heterogeneously mixing population is always smaller than that in a homogeneously mixing population with the same basic reproduction number R00. For other mixing patterns, the relation may be reversed.",
author = "Viggo Andreasen",
year = "2011",
doi = "10.1007/s11538-010-9623-3",
language = "English",
volume = "73",
pages = "2305--2321",
journal = "Bulletin of Mathematical Biology",
issn = "0092-8240",
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number = "10",

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I: Bulletin of Mathematical Biology, Bind 73, Nr. 10, 2011, s. 2305-2321.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

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T1 - The final size of an epidemic and its relation to the basic reproduction number

AU - Andreasen, Viggo

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AB - We study the final size equation for an epidemic in a subdivided population with general mixing patterns among subgroups. The equation is determined by a matrix with the same spectrum as the next generation matrix and it exhibits a threshold controlled by the common dominant eigenvalue, the basic reproduction number R00: There is a unique positive solution giving the size of the epidemic if and only if R00 exceeds unity. When mixing heterogeneities arise only from variation in contact rates and proportionate mixing, the final size of the epidemic in a heterogeneously mixing population is always smaller than that in a homogeneously mixing population with the same basic reproduction number R00. For other mixing patterns, the relation may be reversed.

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JO - Bulletin of Mathematical Biology

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