*Rate per 100,000 population based on the U.S. Census Bureau’s population data as of July 1, 2003
Mumps is an acute viral illness usually resulting in parotitis in approximately 30-40 percent of infected individuals. Other common manifestations include myalgia, anorexia, malaise, headache, and low-grade fever. Up to 20 percent of infections are asymptomatic. Transmission of mumps occurs through airborne transmission or direct contact with infected droplet nuclei or saliva.
Three cases of mumps were reported in Indiana in 2003. The cases were not laboratory confirmed, but all 3 met the case definition for mumps, which is defined as “an illness with acute onset of unilateral or bilateral tender, self-limited swelling of the parotid or other salivary gland, lasting equal to or greater than 2 days without other apparent cause”. Two of the cases had received at least one dose of mumps containing vaccine, and one case had received two doses. There was no evidence of spread from any of the three cases.
Because of the difficulty in distinguishing mumps from other forms of parotitis, IgM mumps-specific serologic testing is strongly recommended on all sporadically reported cases. The specimen should be drawn at least three days following onset of parotitis. Although Indiana has a relatively low number of mumps cases (Figure 1), medical providers should consider mumps diagnosis and serological analysis when parotitis of two days or longer has occurred.