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After the introduction of live attenuated mumps vaccine in 1967 and its incorporation into the mumps-measles-rubella vaccine a decade later, mumps became rare in the U.S. Iowa averaged five cases annually from 1996 through 2005. In 2006, however, 219 cases were reported to the Iowa Department of Public Health by March 28.
The median age of patients was 21 years (range, 3–85 years); 48% of patients were 17–25 years old, and 30% were college students. Of the 133 patients with known vaccination histories, 65% had received the recommended two doses of vaccine, and 14% had received one dose. The most common symptoms were parotitis (83%), submaxillary/sublingual gland swelling (40%), fever (36%), and sore throat (32%). Complications (e.g., orchiti…