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The progression of maternal RSV antibodies in the offspring

M Hacimustafaoglu1, S Celebi, E Aynaci

  • 1Uludag University Medical Faculty, Department of Pediatrics and Pediatric Infectious Diseases, Görükle, Bursa, Turkey. mkemal@uludag.edu.tr

Archives of Disease in Childhood
|January 8, 2004
PubMed

Insights

Maternal anti-RSV IgG antibody levels in newborns decline rapidly in the first six months. Low antibody concentrations (<20 RU/ml) correlated with respiratory syncytial virus (RSV) infection, suggesting a protective threshold.

Area of Science:

  • Immunology
  • Pediatrics
  • Virology

Background:

  • Maternal antibodies are crucial for infant immunity.
  • Respiratory Syncytial Virus (RSV) is a major cause of infant respiratory illness.
  • Understanding antibody decay is key for assessing infant vulnerability.

Purpose of the Study:

  • To track maternal anti-RSV IgG antibody concentrations in newborns over six months.
  • To determine the correlation between antibody levels and RSV infection acquisition.
  • To identify a potential protective antibody threshold against RSV.

Main Methods:

  • Longitudinal study of 49 healthy newborns.
  • Measurement of maternal anti-RSV IgG antibody concentrations.
  • Monitoring for RSV infection and clinical presentation.

Main Results:

  • All infants had maternal anti-RSV IgG at birth; positivity decreased to 2% by 6 months.
  • RSV infection occurred in 8% of infants between 3-6 months.
  • Clinical RSV disease was associated with antibody concentrations below 20 RU/ml.

Conclusions:

  • Maternal anti-RSV IgG wanes significantly in the first six months of life.
  • A threshold of <20 RU/ml may indicate insufficient protection against RSV.
  • Further research is needed to confirm this protective threshold.

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