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Updated: May 10, 2026

An Improved and High Throughput Respiratory Syncytial Virus (RSV) Micro-neutralization Assay
09:14

An Improved and High Throughput Respiratory Syncytial Virus (RSV) Micro-neutralization Assay

Published on: January 26, 2019

Maternal RSV vaccination generates high-affinity antibodies that efficiently transfer to infants, providing enhanced

Dongxiao Liu1, Olivia Posadas1, Ashish K Mishra1

  • 1Division of Viral Products, Center for Biologics Evaluation and Research (CBER), FDA, Silver Spring, MD, USA.

Nature Communications
|May 8, 2026
PubMed

Insights

Maternal respiratory syncytial virus (RSV) vaccination generates high-quality antibodies that transfer to infants, providing crucial passive immunity. This immunization strategy enhances infant protection against RSV infection.

Area of Science:

  • Immunology
  • Vaccinology
  • Maternal-Child Health

Background:

  • Respiratory syncytial virus (RSV) is a major cause of pediatric hospitalizations.
  • Maternal immunization with a bivalent prefusion (preF) RSV vaccine is a new strategy to protect infants.
  • The effects of maternal RSV vaccination on maternal-fetal immunity require further characterization.

Purpose of the Study:

  • To analyze the impact of maternal RSV vaccination on antibody responses and transfer to infants.
  • To assess neutralizing antibody titers, binding antibodies, and antibody affinity maturation.
  • To evaluate placental transfer efficiency of RSV-specific antibodies in relation to gestational age.

Main Methods:

  • Analysis of neutralizing antibody responses against RSV-A2 and RSV-B1 strains.
  • Measurement of binding antibodies to RSV-preF protein and antibody affinity maturation.
  • Comparison of antibody levels and transfer efficiency between vaccinated and unvaccinated pregnant individuals and their infants.

Main Results:

  • Maternal RSV vaccination significantly increased neutralizing antibody titers (8-fold for RSV-A2, 13.4-fold for RSV-B1) compared to unvaccinated individuals.
  • Vaccination enhanced binding antibodies to RSV-preF protein (5.2-fold) and antibody affinity maturation (3.7-fold).
  • High-quality, affinity-matured RSV-specific antibodies were efficiently transferred across the placenta, though preterm infants showed reduced transfer efficiency.

Conclusions:

  • Maternal RSV vaccination elicits robust, high-quality, and affinity-matured antibody responses.
  • These antibodies are effectively transferred to infants, conferring passive immunity.
  • Maternal immunization is a promising strategy for protecting infants against RSV, with considerations for preterm infants.

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