Maternal antibody interference contributes to reduced rotavirus vaccine efficacy in developing countries

Area of Science:

• Immunology
• Vaccinology
• Global Health

Background:

• Rotavirus (RV) vaccine efficacy is lower in lower- and middle-income countries (LMICs) compared to high-income countries.
• Maternal antibodies (matAbs), transferred via placenta and breast milk, may interfere with infant immune responses to oral RV vaccines.

Purpose of the Study:

• To review current research on mechanisms reducing RV vaccine efficacy in LMICs.
• To focus on the role of maternal antibody interference in this disparity.

Main Methods:

• Review of observational studies and existing literature on RV vaccine responses in infants.
• Analysis of the potential impact of maternal immunoglobulin G (IgG) and IgA on vaccine-induced immunity.

Main Results:

• Observational studies show an inverse correlation between maternal antibody titers and infant responses to RV vaccination in LMICs.
• A definitive causal link and the specific mechanisms of interference remain to be established, partly due to limitations in animal models.

Conclusions:

• Maternal antibody interference is a plausible factor contributing to reduced RV vaccine efficacy in LMICs.
• Development of better animal models is crucial for understanding interference mechanisms and designing effective interventions or alternative vaccine strategies.