Transplacental transfer of RSV antibody in Australian First Nations infants

Area of Science:

• Immunology
• Public Health
• Pediatrics

Background:

• Respiratory syncytial virus (RSV) is a major cause of infant hospitalizations.
• Maternal antibodies are crucial for infant protection against severe RSV disease.
• The efficiency of transplacental transfer of RSV antibodies in Aboriginal infants is not well understood.

Purpose of the Study:

• To characterize respiratory syncytial virus (RSV) antibody levels in Australian First Nations mother-infant pairs.
• To investigate factors influencing the transplacental transfer of maternal anti-RSV antibodies.
• To assess the implications for infant protection against RSV disease.

Main Methods:

• Studied 78 Australian First Nations mother-infant pairs.
• Measured RSV antibody (Ab) titers in maternal and cord serum.
• Used multivariable logistic regression to analyze the cord-to-maternal antibody titer ratio (CMTR) and associated covariates.

Main Results:

• The mean cord-to-maternal antibody titer ratio (CMTR) was 1.02, indicating generally efficient transfer.
• One-third of pairs exhibited a CMTR below 1, suggesting impaired antibody transfer.
• Nearly 9% of term infants had low cord RSV antibody levels (
• No significant impact of covariates like birth weight, gestational age, or maternal factors on CMTR was observed.

Conclusions:

• While overall transplacental transfer of RSV antibodies is efficient in this cohort, a significant proportion of First Nations infants may have suboptimal antibody levels.
• Impaired transfer warrants further investigation into its impact on RSV disease severity in First Nations children.
• Mechanistic research is needed to understand and potentially improve infant protection against RSV.