Bulletin of Mathematical Biology

, Volume 69, Issue 3, pp 1067–1091

Approximation of the Basic Reproduction Number R0 for Vector-Borne Diseases with a Periodic Vector Population

  • Nicolas Bacaër
Original Article

DOI: 10.1007/s11538-006-9166-9

Cite this article as:
Bacaër, N. Bull. Math. Biol. (2007) 69: 1067. doi:10.1007/s11538-006-9166-9


The main purpose of this paper is to give an approximate formula involving two terms for the basic reproduction number R0 of a vector-borne disease when the vector population has small seasonal fluctuations of the form p(t) = p0 (1+ε cos (ωt − φ)) with ε ≪ 1. The first term is similar to the case of a constant vector population p but with p replaced by the average vector population p0. The maximum correction due to the second term is (ε2/8)% and always tends to decrease R0. The basic reproduction number R0 is defined through the spectral radius of a linear integral operator. Four numerical methods for the computation of R0 are compared using as example a model for the 2005/2006 chikungunya epidemic in La Réunion. The approximate formula and the numerical methods can be used for many other epidemic models with seasonality.


Epidemics Basic reproduction number Seasonality 

Copyright information

© Springer Science+Business Media, Inc. 2007

Authors and Affiliations

  • Nicolas Bacaër
    • 1
  1. 1.Institut de Recherche pour le Développement (I.R.D.)Bondy CedexFrance