PMID: 9544458Apr 17, 1998Paper

Measles outbreaks in the Bern canton

Schweizerische medizinische Wochenschrift
A M Maurer, K Mühlemann

Abstract

Currently, overall vaccination coverage against measles among infants ranges between 77% and 89% in Switzerland. Experience in other countries has shown that this level of vaccination is not sufficient to prevent measles outbreaks, especially among schoolchildren. During 1992 surveillance for measles outbreaks in closed populations was conducted in the Canton of Berne. Outbreaks were investigated for vaccine efficacy. Two measles outbreaks in schoolchildren were observed during the study period. In 2 Bernese suburban schools 6 measles cases in children (median age 12.5 years) occurred over a period of 37 days. One of the cases had been vaccinated. Vaccination rate in the healthy control children was 89.7%. Estimated vaccine efficacy was 97.7% (95% confidence interval [CI]: 68%, 99%). The second outbreak occurred in a rural region and comprised 21 measles cases (median age 7.5 years) within 43 days. 10 (47.6%) of the cases attended the same school. None of the cases had been vaccinated. Of the healthy control children 82.6% had received measles vaccine. Estimated vaccine efficacy was 100% (CI: 87%, 100%). These two measles outbreaks were due to failure to vaccinate rather than low vaccine efficacy. Surveillance for measles cases...Continue Reading

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