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Studies on live rubella vaccine. V. Quantitative aspects of interference between rubella, measles and mumps viruses
Abstract:
Rubella vaccine combined with measles and mumps vaccines was administered in a single injection to children of 1 to 5 years of age. All three vaccines were serologically effective, and the clinical reactions caused by measles vaccine were considerably alleviated, when 6 x 10(3) PFU of rubella and 10(4) TCD50 per dose of mumps vaccines were combined with 5 x 10(4) TCD50 of measles vaccine. When a larger amount of mumps vaccine (3 x 10(5) TCD50/dose) was used, it caused interference with the rubella and measles viruses, i.e., the antibody response to rubella virus became poor and the incidence of clinical reactions to measles virus decreased. On the other hand, when 5 x 10(5) TCD50/dose of measles vaccine was combined with 10(4) TCD50/dose of mumps vaccine, the clinical reactions to measles virus were decreased but were almost the same as those induced by this vaccine alone.
Insights
Combining measles, mumps, and rubella vaccines in a single shot proved effective for children aged 1-5. Optimal vaccine concentrations were identified to ensure efficacy and reduce measles vaccine reactions.
Area of Science:
- Pediatrics
- Immunology
- Vaccinology
Background:
- Measles, mumps, and rubella (MMR) vaccines are routinely administered to children.
- Investigating optimal antigen concentrations for combined MMR vaccines is crucial for efficacy and safety.
- Previous studies have explored combined vaccine formulations, but optimal dosing requires further investigation.
Purpose of the Study:
- To evaluate the serological effectiveness and clinical reactions of a combined measles, mumps, and rubella (MMR) vaccine in children aged 1 to 5 years.
- To determine the optimal antigen dosage for each component vaccine within the combination to maximize efficacy and minimize adverse reactions.
- To assess potential viral interference between vaccine components at different concentrations.
Main Methods:
- Children aged 1 to 5 years received a single injection containing combined measles, mumps, and rubella vaccines.
- Different antigen concentrations of rubella (6 x 10^3 PFU/dose), mumps (10^4 TCD50/dose and 3 x 10^5 TCD50/dose), and measles (5 x 10^4 TCD50/dose and 5 x 10^5 TCD50/dose) vaccines were tested.
- Serological responses to all three viruses were assessed.
- Clinical reactions, particularly those associated with the measles vaccine, were monitored.
Main Results:
- A combination of 6 x 10^3 PFU/dose rubella, 10^4 TCD50/dose mumps, and 5 x 10^4 TCD50/dose measles vaccine was serologically effective.
- This specific dosage combination significantly alleviated clinical reactions caused by the measles vaccine.
- A higher dose of mumps vaccine (3 x 10^5 TCD50/dose) interfered with rubella virus antibody response and reduced measles reactions.
- A higher dose of measles vaccine (5 x 10^5 TCD50/dose) with 10^4 TCD50/dose mumps vaccine reduced measles reactions but showed no significant difference compared to measles vaccine alone.
Conclusions:
- The combined measles, mumps, and rubella vaccine is serologically effective in children aged 1 to 5 years.
- Specific antigen concentrations are critical; a combination of 6 x 10^3 PFU/dose rubella, 10^4 TCD50/dose mumps, and 5 x 10^4 TCD50/dose measles vaccine is recommended.
- Higher antigen doses can lead to viral interference and altered immune responses, necessitating careful formulation of combined vaccines.