Mumps in Iowa
Of the 219 cases of mumps in Iowa:
- The average patient age was 21 years (ages ranged from 3 to 85 years)
- Approximately 48 percent of patients were between the ages of 17 and 25
- Approximately 30 percent were known to be college students.
Of the 133 patients whose vaccine history was investigated:
- Around 87 people (65 percent) had documentation proving they had received two doses
- Nineteen people (14 percent) had documentation proving they had received one dose
- Eight people (6 percent) had received no doses
- Vaccine status could not be documented in 19 people (14 percent).
Among the 114 patients for whom mumps symptoms information was available, the most common symptoms were:
- Around 83 percent had parotitis (swelling of the parotid salivary glands)
- Approximately 40 percent had submaxillary/sublingual salivary gland swelling
- About 36 percent had fever
- Approximately 32 percent had sore throat.
The average length of illness was 5.1 days.
Five percent of patients reported complications of mumps, with one suspected case of encephalitis being investigated.
The source of mumps in Iowa is unknown; however, the United Kingdom experienced a recent outbreak that peaked during 2005, with approximately 56,000 cases and a high attack rate among young adults. The mumps strain in the United Kingdom epidemic also was identified as genotype G, and it may be linked to the 2005 mumps outbreak in the United States.