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Comparative efficacy of three mumps vaccines during disease outbreak in eastern Switzerland: cohort study

After the introduction of immunisation against measles, mumps, and rubella, numerous outbreaks of mumps were reported in the 1980s and ‘90s in Switzerland and southern Europe.1 2 The Rubini strain is still widely used in Europe,3 and we report here a large outbreak of mumps in a population with a high vaccination rate and examine the differential efficacy of the three vaccine strains.

An outbreak was investigated in a small village in Switzerland. All children (ages 5-13) were included in the cohort. Information on immunisation status was obtained from vaccine certificates. The person who investigated the cases of mumps was blinded with regard to the vaccination status. A case was defined if mumps virus was isolated on culture, if a doctor confirmed the diagnosis, or if the typical clinical picture was described in a sibling of a patient with confirmed disease. The absence of IgG antibodies to mumps virus served as confirmation of full susceptibility to …