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[Reactions after MMR vaccination]
K Kaaber1, I S Samuelsson, S O Larsen
1Statens Seruminstitut, København, Epidemiologisk afdeling og biostatistisk afdeling.
Abstract:
Four months after introducing routine vaccination against measles, mumps and German measles (MMR-vaccination) in Denmark, a questionnaire study of reactions in vaccinated children was carried out. There were significantly fewer reactions in children who had previously developed immunity to measles, either by having had the disease or by vaccination. The reaction frequency after MMR-vaccination of children immune to measles was no greater than that after other vaccinations. Moreover, for all vaccinations, the frequency of reaction was found to decrease significantly with increasing age. The study suggests that a large proportion of the so-called reactions were not caused by vaccination, but were due to common viral infections occurring at random and concurrently with it. The reactions that arose in connection with MMR-vaccination are considered to be of minor importance when compared with often prolonged and more severe course of these diseases.
Insights
Reactions after measles, mumps, and rubella (MMR) vaccination were less common in children already immune to measles. This suggests many reported reactions were coincidental viral infections, not vaccine-related.
Area of Science:
- Pediatrics
- Immunology
- Public Health
Context:
- Routine measles, mumps, and rubella (MMR) vaccination was implemented in Denmark.
- A questionnaire study was conducted four months post-implementation to assess vaccine reactions.
- Previous immunity to measles (from disease or vaccination) was a key factor investigated.
Purpose:
- To evaluate the frequency and nature of adverse reactions following MMR vaccination in children.
- To determine if pre-existing measles immunity influences the reaction rate to MMR vaccine.
- To assess the impact of age on vaccination reaction frequency.
Summary:
- Significantly fewer reactions were observed in children with prior measles immunity compared to those without.
- The reaction rate in measles-immune children post-MMR vaccination was comparable to other routine immunizations.
- Vaccination reaction frequency decreased significantly with increasing age.
- A substantial portion of reported "reactions" were attributed to concurrent, common viral infections rather than the vaccine itself.
Impact:
- Suggests that many adverse events reported post-MMR vaccination may be coincidental viral illnesses.
- Indicates that MMR vaccine reactions are generally minor compared to the severity of the diseases prevented.
- Provides evidence supporting the safety profile of MMR vaccination in a routine public health program.