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Age of measles immunization in tropics
Insights
Maternal measles immunity wanes quickly in infants. This study suggests vaccinating children in developing countries at 6 months, with a booster 3-4 months later, for better protection.
Area of Science:
- Immunology
- Pediatrics
- Public Health
Background:
- Maternal antibodies provide crucial early protection against infectious diseases like measles.
- Measles complications and mortality disproportionately affected younger children in lower socio-economic groups in past decades.
- Understanding the decline of maternal measles immunity is vital for optimizing vaccination strategies.
Purpose of the Study:
- To assess the levels and duration of maternal measles immunity in infants.
- To inform evidence-based recommendations for measles vaccination timing in developing countries.
Main Methods:
- Studied maternal immunity using hemagglutination-inhibition antibody titers.
- Analyzed antibody levels in 500 newborns and 500 infants aged 1-12 months before vaccination.
- Correlated antibody levels with age and previous epidemiological data.
Main Results:
- Newborns had a geometric mean titer of 16 for measles antibodies.
- Measles antibody titers were largely absent in infants aged 3-5 months.
- Historical data indicated high measles complication rates in 5-9 month olds from lower socio-economic backgrounds.
Conclusions:
- Maternal measles immunity diminishes significantly by 3-5 months of age.
- Early measles vaccination at 6 months is recommended for infants in developing countries.
- A secondary measles vaccination 3-4 months after the initial dose is advised for sustained protection.
Abstract:
Maternal immunity to measles was studied in a group of 500 newborn children and another group of 500 children aged one to 12 months, before vaccination. The geometric mean titer of detectable hemagglutination-inhibition antibody was 16 for newborn children. This titer was absent in most children aged 3 to 5 months. Our previous studies indicate that from 1970 to 1972, children from the lower socio-economic classes aged 5 to 9 months were the main target of measles complications and deaths. Based on the present data, we suggest that children in developing countries should be vaccinated as young as 6 months and should be revaccinated 3 to 4 months later to assure full protection.