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Reconsideration of the use of meningococcal polysaccharide vaccine

Dan M Granoff1, Andrew J Pollard

  • 1Center for Immunobiology and Vaccine Development, Children's Hospital Oakland Research Institute, Oakland, CA, USA. drgranoff@chori.org

The Pediatric Infectious Disease Journal
|September 13, 2007
PubMed

Insights

Meningococcal polysaccharide vaccines may hinder immune responses to future vaccinations in children. Conjugate vaccines are recommended for high-risk children to improve protection against meningococcal disease.

Area of Science:

  • Immunology
  • Vaccinology
  • Public Health

Background:

  • Quadrivalent meningococcal conjugate vaccine licensed in 2005 for ages 11-55.
  • Unconjugated meningococcal polysaccharide (MPS) vaccine recommended for high-risk children (2-10 years).
  • Concerns regarding vaccine-induced hyporesponsiveness and immune memory.

Purpose of the Study:

  • Review evidence on MPS vaccination impacting antibody responses.
  • Evaluate MPS as a probe for immunologic memory.
  • Discuss implications for vaccine recommendations and licensure requirements.

Main Methods:

  • Review of existing scientific literature and clinical trial data.
  • Analysis of antibody responses following MPS and conjugate vaccine administration.
  • Assessment of B cell memory dynamics post-vaccination.

Main Results:

  • Evidence suggests MPS vaccination can impair subsequent antibody responses (hyporesponsiveness).
  • MPS challenge can extinguish conjugate vaccine-induced immunologic memory.
  • Conjugate vaccination, conversely, regenerates memory B cells.

Conclusions:

  • Consider off-label use of conjugate vaccines for high-risk children instead of MPS vaccine.
  • Re-evaluate licensure requirements for new glycoconjugate vaccines, including comparative trials and MPS challenge.
  • Explore safer methods for assessing vaccine-induced immunologic memory.

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