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Kinetics of maternal hepatitis a antibody decay in infants: implications for vaccine use
Jay M Lieberman1, Swei-ju Chang Chang, Susan Partridge
1Miller Children's Hospital Long Beach, CA 90806, USA. jay_lieberman@hotmail.com
Insights
Maternal hepatitis A antibody levels remain high in infants for the first six months. However, antibody decay is significant by 12 months of age, impacting infant immunity.
Area of Science:
- Immunology
- Pediatrics
- Public Health
Background:
- Hepatitis A is a significant public health concern.
- Maternal antibodies play a crucial role in protecting infants from infectious diseases during early life.
- Understanding the duration of maternal hepatitis A antibody protection is essential for vaccination strategies.
Purpose of the Study:
- To evaluate the decay kinetics of maternal hepatitis A antibodies in infants.
- To determine the seropositivity rates of hepatitis A antibodies in infants at different ages.
- To assess the duration of passive immunity conferred by maternal hepatitis A antibodies.
Main Methods:
- A seroepidemiologic study was conducted.
- Serum samples were collected from 200 infants at 2, 4, 6, and 12 months of age.
- Hepatitis A antibody titers were measured using standardized immunoassays.
Main Results:
- At 2 months, 38% of infants were hepatitis A antibody-positive with a geometric mean titer of 2634 mIU/ml.
- Seropositivity rates remained high at 4 months (100%) and 6 months (95%).
- A significant decay in antibody levels was observed by 12 months, with a seropositivity rate of 39%.
Conclusions:
- Maternal hepatitis A antibodies provide substantial protection during the first six months of life.
- Antibody levels decline significantly by 12 months of age.
- These findings have implications for the timing of hepatitis A vaccination in infants.
Abstract:
We conducted a seroepidemiologic study to evaluate the kinetics of maternal hepatitis A antibody decay in infants. Serum samples obtained from 200 infants at 2 and 4 months of age were tested for hepatitis A antibody. Seventy-six infants (38%) were hepatitis A antibody-positive with a geometric mean antibody titer of 2634 mIU/ml. Samples collected at 4, 6 and/or 12 months of age showed seropositivity rates of 100, 95 and 39%, respectively. These data indicate that maternal antibody levels remained high through the first 6 months of life but decayed significantly by 12 months of age.