Estimating Serotype-specific Efficacy of Pneumococcal Conjugate Vaccines Using Hierarchical Models

Epidemiology. 2020 Mar;31(2):259-262. doi: 10.1097/EDE.0000000000001135.

Abstract

Pneumococcal conjugate vaccines target 10 or 13 specific serotypes. To evaluate the overall efficacy of these products, the vaccine-targeted serotypes are typically aggregated into a single group. However, it is often desirable to evaluate variations in effects for different serotypes. These serotype-specific estimates are often based on small counts, resulting in a high degree of uncertainty (i.e., large standard errors and wide confidence intervals). An alternative is to use a hierarchical Bayesian statistical model, which estimates overall effectiveness while simultaneously providing estimates of serotype-specific vaccine effects. These shrunken serotype-specific estimators often have smaller mean squared errors (MSEs) than unbiased versions due to a large decrease in posterior uncertainty. We reanalyzed published data from a randomized controlled trial on the efficacy of 13-valent pneumococcal conjugate vaccine (PCV13) against community-acquired pneumonia caused by vaccine-targeted serotype using a hierarchical model. This model provides a potential framework for obtaining estimates of serotype-specific vaccine effects with reduced MSEs.

MeSH terms

  • Bayes Theorem
  • Humans
  • Models, Statistical
  • Pneumococcal Vaccines* / therapeutic use
  • Pneumonia, Pneumococcal* / genetics
  • Pneumonia, Pneumococcal* / prevention & control
  • Randomized Controlled Trials as Topic
  • Serogroup*
  • Treatment Outcome
  • Vaccines, Conjugate / therapeutic use

Substances

  • Pneumococcal Vaccines
  • Vaccines, Conjugate