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Simulating partial vaccine protection: BCG in badgers.

Graham C Smith1, Ann Barber2, Philip Breslin3

  • 1National Wildlife Management Centre, APHA, Sand Hutton, York, UK.

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|April 22, 2022
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Summary
This summary is machine-generated.

Understanding the long-term effects of repeated vaccination campaigns on wildlife disease prevalence is vital. This study models partial protection from the BCG vaccine in badgers, showing disease eradication is possible even with varied vaccine efficacy.

Keywords:
Bovine TBImperfect vaccinationModelPartial vaccination

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Area of Science:

  • Wildlife disease management
  • Veterinary immunology
  • Epidemiological modeling

Background:

  • Vaccination is a limited tool in wildlife disease control.
  • The BCG vaccine is used for bovine tuberculosis in badgers.
  • Existing models assume perfect vaccine protection, neglecting partial efficacy.

Purpose of the Study:

  • To model the long-term effects of repeated vaccination campaigns on disease prevalence.
  • To explore pathways of partial protection from the BCG vaccine in badgers.
  • To assess the impact of partial vaccine efficacy on disease control.

Main Methods:

  • Expert workshop to identify pathways of partial BCG vaccine protection in badgers.
  • Simulation using an established epidemiological model incorporating these pathways.
  • Analysis of disease eradication potential under different efficacy scenarios.

Main Results:

  • Partial protection pathways include no benefit, delayed disease progression, or blocked onward transmission.
  • Simulations showed reduced vaccination effects with partial protection.
  • Disease eradication remained possible in isolated populations across all modeled scenarios.

Conclusions:

  • Partial protection from the BCG vaccine significantly impacts disease control dynamics in badgers.
  • Further investigation is needed to identify the predominant pathways of vaccine failure.
  • Modeling partial protection is crucial for accurate predictions in wildlife vaccination programs.