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Related Experiment Videos

The basic reproduction number for scrapie.

L Matthews1, M E Woolhouse, N Hunter

  • 1Centre for Tropical Veterinary Medicine, University of Edinburgh, Midlothian, UK. louise.matthews@ed.ac.uk

Proceedings. Biological Sciences
|June 25, 1999
PubMed
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The basic reproduction number (R0) quantifies infectious disease spread. Reducing susceptibility alleles and understanding inbreeding effects are key to controlling scrapie outbreaks in sheep populations.

Area of Science:

  • Veterinary epidemiology
  • Infectious disease modeling
  • Animal genetics

Background:

  • Scrapie is a fatal prion disease affecting sheep.
  • Understanding transmission dynamics is crucial for disease control.
  • The basic reproduction number (R0) is a key epidemiological parameter.

Purpose of the Study:

  • To derive a mathematical expression for R0 for scrapie in sheep.
  • To assess the sensitivity of R0 to various epidemiological parameters.
  • To examine the impact of genetic variation and inbreeding on R0.

Main Methods:

  • Developed a mathematical model incorporating sheep demography, incubation period, genetic susceptibility, and transmission routes.
  • Assessed the sensitivity of R0 to key parameters.

Related Experiment Videos

  • Calculated R0 for a specific Cheviot sheep flock outbreak.

    • Main Results:

    • A reduction in the susceptibility allele frequency most effectively reduces R0 when the allele is recessive.
    • Inbreeding can increase R0, potentially increasing outbreak risk, especially with recessive alleles.
    • R0 was calculated for a Cheviot sheep flock experiencing a scrapie outbreak.

    Conclusions:

    • Genetic variation and population structure significantly influence scrapie transmission.
    • Targeting susceptibility alleles and understanding inbreeding are vital for managing scrapie.
    • The derived R0 formulation provides a tool for assessing and managing scrapie risks.