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A general model for the African trypanosomiases.

D J Rogers1

  • 1Department of Zoology, University of Oxford.

Parasitology
|August 1, 1988
PubMed
Summary

A mathematical model shows that animal reservoirs are crucial for maintaining African trypanosomiases in humans. This vector-borne disease model highlights the importance of animal hosts for disease prevalence and transmission dynamics.

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Area of Science:

  • Epidemiology
  • Mathematical Biology
  • Veterinary Medicine

Background:

  • Vector-borne diseases, such as African trypanosomiases, pose significant public health challenges.
  • Existing models often simplify host-vector interactions, limiting their applicability to complex transmission dynamics.

Purpose of the Study:

  • To develop and apply a general mathematical model for vector-borne diseases with multiple host species.
  • To investigate the transmission dynamics of African trypanosomiases, considering two vertebrate hosts and one insect vector.

Main Methods:

  • Developed a general mathematical model extending a single-host malaria model.
  • Incorporated incubation and immune periods for hosts and variable transmission efficiencies.
  • Utilized 3-dimensional phase-plane analysis for model predictions.
  • Derived parameter values from literature for a West African village scenario.

Main Results:

  • Model predicts significant equilibrium prevalences of Trypanosoma species in animal hosts and tsetse vectors.
  • Human infection with Trypanosoma brucei was predicted at 7.0%, with a low contribution from human hosts to disease reproduction.
  • Animal hosts are essential for maintaining human sleeping sickness, not just its prevalence.

Conclusions:

  • The animal reservoir is critical for the sustained occurrence and prevalence of African trypanosomiases in humans.
  • Model demonstrates the impact of vector density and seasonal changes on disease incidence.
  • Disease incidence dynamics are influenced by fly population size, mortality rates, and host susceptibility.

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