| mumps outbreak in a highly vaccinated population. | from october 1988 to april 1989, a large mumps outbreak occurred in douglas county, kansas. of the 269 cases, 208 (77.3%) occurred among primary and secondary school students, of whom 203 (97.6%) had documentation of mumps vaccination. attack rates were highest for students attending junior high school (8.0%), followed by high school (2.0%) and elementary school (0.7%). a retrospective cohort study conducted at one junior high school with an attack rate of 12.9% did not find age at vaccination o ... | 1991 | 1861205 |