Heterologous and sex differential effects of administering vitamin A supplementation with vaccines

Kristoffer J. Jensen, Jorjoh Ndure, Magdalena Plebanski, Katie L. Flanagan

Research output: Contribution to journalArticleResearchpeer-review

8 Citations (Scopus)

Abstract

WHO recommends high-dose vitamin A supplementation (VAS) to children from 6 months to 5 years of age in low-income countries, in order to prevent and treat vitamin A deficiency-associated morbidity and mortality. The current policy does not discriminate this recommendation either by sex or vaccination status of the child. There is accumulating evidence that the effects of VAS on morbidity, mortality and immunological parameters depend on concomitant vaccination status. Moreover, these interactions may manifest differently in males and females. Certain vaccines administered through the Expanded Program on Immunization have been shown to alter all-cause mortality from infections other than the vaccine-targeted disease. This review summarizes the evidence from observational studies and randomized-controlled trials of the effects of VAS on these so-called heterologous or non-specific effects of vaccines, with a focus on sex differences. In general, VAS seems to enhance the heterologous effects of vaccines, particularly for diphtheria-tetanus-pertussis and live measles vaccines, where some studies, although not unanimously, show a stronger interaction between VAS and vaccination in females.We suggest that vaccination status and sex should be considered when evaluating the effects of VAS in early life.

Original languageEnglish
Pages (from-to)36-45
Number of pages10
JournalTransactions of the Royal Society of Tropical Medicine and Hygiene
Volume109
Issue number1
DOIs
Publication statusPublished - 2015

Keywords

  • All-cause mortality
  • BCG vaccine
  • DTP vaccine
  • Measles vaccine
  • Sex
  • Vitamin A

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