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Transmission dynamics of Toxoplasma gondii along an urban–rural gradient

Author

Listed:
  • Lélu, M.
  • Langlais, M.
  • Poulle, M.-L.
  • Gilot-Fromont, E.

Abstract

Recently, several authors have proposed that the availability of intermediate hosts (IHs) for definitive hosts (DHs) may contribute to determining the dynamics and evolutionary ecology of parasites with facultative complex life cycles. The protozoa Toxoplasma gondii may be transmitted to DHs either via predation of infected IHs through a complex life cycle (CLC) or directly from a contaminated environment through a simple life cycle (SLC). This parasite is also present in contrasting host density environments. We tested the hypothesis that the relative contributions of the CLC and SLC along an urban–rural gradient depend on the IH supply. We built and analysed a deterministic model of the T. gondii transmission cycle. The SLC relative contribution is important only in urban-type environments, i.e., with low predation rate on IHs. In contrast, the parasite is predominantly transmitted through a CLC in suburban and rural environments. The association of the two cycles enables the parasite to spread in situations of low IH availability and low DH population size for which each cycle alone is insufficient.

Suggested Citation

  • Lélu, M. & Langlais, M. & Poulle, M.-L. & Gilot-Fromont, E., 2010. "Transmission dynamics of Toxoplasma gondii along an urban–rural gradient," Theoretical Population Biology, Elsevier, vol. 78(2), pages 139-147.
    • Handle: RePEc:eee:thpobi:v:78:y:2010:i:2:p:139-147
    DOI: 10.1016/j.tpb.2010.05.005
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    References listed on IDEAS

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    1. Arenas, Abraham J. & González-Parra, Gilberto & Villanueva Micó, Rafael-J., 2010. "Modeling toxoplasmosis spread in cat populations under vaccination," Theoretical Population Biology, Elsevier, vol. 77(4), pages 227-237.
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    More about this item

    Keywords

    Complex life cycle; Simple life cycle; Toxoplasmosis; R0; Trophic transmission;
    All these keywords.

    JEL classification:

    • R0 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - General

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