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Background and Design. Measles outbreaks are being reported from vaccinated populations. This study was carried out in vaccinated Kazak students' dormitory in Istanbul.
Results. All of the 87 students in the school were male and the mean age was 18.2. (1225) We diagnosed measles in 13 (15%) students. The mean age of the patients was 17.5. (1222) The mean ages of the patients and the healthy ones were statistically similar. Eleven patients (85%) were positive for measles IgM. All healthy students except for two were positive for measles IgG.
Conclusion. These findings indicate that the measles outbreak in this mostly vaccination population has occurred among nonimmune students and it is not due to decreased immunity after vaccination.