Transmission Models for Hermaphroditic Helminthiasis

  • Ingemar Nåsell
Part of the Lecture Notes in Biomathematics book series (LNBM, volume 59)


The life cycle of hermaphroditic helminths is very similar to that of schistosomes. The main difference from a transmission standpoint is that eggs are laid by all sexually mature parasites in hermaphroditic helminthiasis, while only mated female parasites lay eggs in schistosomiasis. This has the consequence that the a infectivity of the definitive host population is determined by the total number of mature parasites in hermaphroditic helminthiasis and by the total number of mated female parasites in schistosomiasis. This consequence is of direct imortance for the formulation of transmission models for the two infections. In both cases, it is necessary to account for superinfection of definitive hosts.


Phase Portrait Parasite Load Human Host Transmission Model Transmission Factor 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1985

Authors and Affiliations

  • Ingemar Nåsell
    • 1
  1. 1.Department of MathematicsThe Royal Institute of TechnologyStockholmSweden

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