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Kinetics of maternal antibodies against rubella and varicella in infants

E Leuridan1, N Hens, V Hutse

  • 1Centre for Evaluation of Vaccination, Vaccine and Infectious Disease Institute, Faculty of Medicine, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Antwerp, Belgium. elke.leuridan@ua.ac.be

Vaccine
|June 19, 2010
PubMed

Insights

Maternal antibodies for rubella and varicella wane in infants within 2-3 months. This passive immunity duration leaves infants vulnerable to both diseases in early life.

Area of Science:

  • Immunology
  • Pediatrics
  • Infectious Diseases

Background:

  • Maternal antibodies provide crucial early protection for infants.
  • Understanding the decay kinetics of these antibodies is vital for assessing infant susceptibility to vaccine-preventable and endemic diseases.

Purpose of the Study:

  • To longitudinally analyze the decay of maternal rubella IgG and varicella IgG antibodies in infants.
  • To determine the duration of passive immunity conferred by maternal antibodies against rubella and varicella.

Main Methods:

  • Longitudinal study of 213 mother-infant pairs in Belgium.
  • Blood sampling at 7 time points from pregnancy week 36 to 12 months postpartum.
  • Enzyme-linked immunosorbent assay (ELISA) for quantifying anti-rubella IgG and anti-varicella IgG.
  • Generalized exponential model applied to analyze antibody decay.

Main Results:

  • The mean duration of passive immunity was 2.1 months for rubella antibodies.
  • The mean duration of passive immunity was 2.4 months for varicella antibodies.
  • Infants become susceptible to rubella and varicella at a young age.

Conclusions:

  • Maternal antibody decay leads to a limited window of passive immunity in infants.
  • Infants are susceptible to rubella and varicella during the first few months of life.
  • This highlights the importance of timely vaccination strategies for both diseases.

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