doi: 10.1016/j.mbs.2007.07.005.
Epub 2007 Aug 6.
Growth rate and basic reproduction number for population models with a simple periodic factor
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- PMID: 17822724
- DOI: 10.1016/j.mbs.2007.07.005
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Growth rate and basic reproduction number for population models with a simple periodic factor
Math Biosci.
2007 Dec.
Abstract
For continuous-time population models with a periodic factor which is sinusoidal, both the growth rate and the basic reproduction number are shown to be the largest roots of simple equations involving continued fractions. As an example, we reconsider an SEIS model with a fixed latent period, an exponentially distributed infectious period and a sinusoidal contact rate studied in Williams and Dye [B.G. Williams, C. Dye, Infectious disease persistence when transmission varies seasonally, Math. Biosci. 145 (1997) 77]. We show that apart from a few exceptional parameter values, the epidemic threshold depends not only on the mean contact rate, but also on the amplitude of fluctuations.
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