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Efficacy of pentavalent human-bovine (WC3) reassortant rotavirus vaccine based on breastfeeding frequency

Michelle G Goveia1, Mark J DiNubile, Michael J Dallas

  • 1From Merck & Co., Inc., West Point, PA, USA.

The Pediatric Infectious Disease Journal
|June 4, 2008
PubMed

Insights

This study found that breastfeeding frequency did not negatively impact the effectiveness of the pentavalent rotavirus vaccine in preventing rotavirus gastroenteritis (RVGE). The vaccine demonstrated high efficacy across all breastfeeding groups.

Area of Science:

  • Pediatrics
  • Vaccinology
  • Infectious Diseases

Background:

  • Rotavirus gastroenteritis (RVGE) is a significant cause of infant morbidity worldwide.
  • The pentavalent rotavirus vaccine is a key intervention for RVGE prevention.
  • Breastfeeding is known to provide passive immunity, raising questions about its interaction with vaccine efficacy.

Purpose of the Study:

  • To retrospectively assess the efficacy of a live, oral, pentavalent rotavirus vaccine.
  • To determine if breastfeeding frequency influences vaccine efficacy against rotavirus gastroenteritis (RVGE).

Main Methods:

  • A retrospective analysis was conducted on data from 5098 infants participating in a placebo-controlled trial.
  • Infants were categorized based on breastfeeding frequency: never breastfed, sometimes breastfed, and exclusively breastfed.
  • Vaccine efficacy against any RVGE severity and severe RVGE was calculated for each breastfeeding group.

Main Results:

  • Vaccine efficacy against any RVGE severity was 68.3% (never breastfed), 82.2% (sometimes breastfed), and 68.0% (exclusively breastfed).
  • Vaccine efficacy against severe RVGE was 100% (never breastfed), 95.4% (sometimes breastfed), and 100% (exclusively breastfed).
  • No adverse impact of breastfeeding frequency on pentavalent rotavirus vaccine efficacy was observed.

Conclusions:

  • Breastfeeding frequency does not appear to diminish the protective effect of the pentavalent rotavirus vaccine.
  • The pentavalent rotavirus vaccine maintains high efficacy regardless of infant breastfeeding status.
  • Findings support the concurrent use of rotavirus vaccination and breastfeeding for optimal infant protection.

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