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Related Experiment Videos

Minimum attack rate for measuring measles vaccine efficacy

P Nourjah1, R R Frerichs

  • 1WESTAT, Rockville, MD 20850, USA.

International Journal of Epidemiology
|August 1, 1995
PubMed
Summary
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Herd immunity significantly impacts measles vaccine efficacy (VE) estimation. Higher vaccination coverage reduces bias, making the 5% attack rate assumption more reliable when population immunity is high.

Area of Science:

  • Epidemiology
  • Immunology
  • Mathematical Modeling

Background:

  • Investigating the validity of the 5% attack rate threshold for measles vaccine efficacy (VE) studies.
  • Assessing the influence of herd immunity on VE estimation bias.

Purpose of the Study:

  • To evaluate the impact of herd immunity on the accuracy of vaccine efficacy estimation.
  • To determine if an attack rate of 5% or higher is sufficient for unbiased VE assessment.

Main Methods:

  • Utilized a computer simulation model based on the stochastic Reed-Frost model.
  • Conducted 200 trials to analyze variations in VE estimation bias.
  • Examined the effects of attack rate, herd immunity, and vaccination coverage.

Main Results:

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  • Higher attack rates correlated with decreased herd immunity and reduced bias in VE estimation.
  • The probability of adequate contact and number of susceptibles are key factors influencing attack rate.
  • Increased vaccination coverage, even at a given attack rate, led to lower bias in VE estimation.

Conclusions:

  • The assumption of unbiased VE estimation at attack rates of 5% or more is more valid with higher population immunity.
  • Herd immunity plays a critical role in the reliability of field-based VE assessments.
  • Vaccination coverage is a crucial determinant of bias in VE studies.