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Measles, mumps and rubella immunization at nine months in a developing country
B D Schoub1, S Johnson, J M McAnerney
1National Institute for Virology, Sandringham, South Africa.
Insights
A measles, mumps, and rubella (MMR) vaccine showed similar safety and effectiveness in 9-month-old and 15-month-old South African children. This suggests MMR vaccine could replace the current measles vaccine at 9 months, offering broader protection.
Area of Science:
- Pediatrics
- Immunology
- Vaccinology
Background:
- Measles vaccination is typically administered at 9 months in South Africa.
- The introduction of a combined measles, mumps, and rubella (MMR) vaccine could potentially enhance public health benefits.
- Evaluating the immunogenicity and safety of MMR vaccine in infants is crucial for policy decisions.
Purpose of the Study:
- To compare the antibody responses and reactogenicity of an MMR vaccine in 9-month-old versus 15-month-old black South African children.
- To assess the feasibility of replacing the routine 9-month measles vaccination with an MMR vaccine.
Main Methods:
- A comparative study involving two age groups of black children (9-month-olds and 15-month-olds) in South Africa.
- Measurement of antibody responses to measles, mumps, and rubella components post-vaccination.
- Assessment of vaccine reactogenicity (side effects) in both age groups.
Main Results:
- The measles antibody response was marginally better in the 15-month-old group.
- No significant differences in antibody responses to mumps and rubella components were observed between the groups.
- Vaccine reactogenicity was comparable across both age groups, indicating similar safety profiles.
Conclusions:
- A trivalent measles, mumps, and rubella vaccine can be safely and effectively administered at 9 months of age in this population.
- Replacing routine 9-month measles vaccination with MMR could offer improved herd immunity against rubella and reduce mumps complications.
- The cost-effectiveness of using an MMR vaccine warrants consideration for public health policy in developing countries.
Abstract:
The antibody responses and reactogenicity of a measles, mumps and rubella vaccine in 9-month-old and 15-month-old black children in South Africa were compared. The antibody response to the measles component was marginally better in the older group, but no differences were observed in the response to the mumps and rubella components. Reactogenicity was similar in the two age groups. Therefore it is possible that a trivalent measles, mumps and rubella vaccine can safely and effectively replace routine measles immunization at 9 months of age in this population. Whether routine immunization policy should incorporate such a vaccine depends on the extent of acceptance of measles vaccination. In urban populations of developing countries with high rates of measles immunization, routine vaccination at 9 months might interrupt circulating wild type rubella and provide sufficient herd immunity to protect susceptible women of childbearing age. It also should decrease significantly the complications associated with wild type mumps infection. The replacement of measles vaccine by a trivalent vaccine may be very cost-effective.
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