Mumps resurgence prompts revised recommendations.

Mumps outbreaks in 2006 served as a reminder that this often-overlooked, vaccine-preventable disease is still a threat. The outbreaks were concentrated in Iowa but affected several other states in the Midwest. As clinicians and public health officials considered Minnesota's vulnerability to a mumps outbreak, they discovered gaps in immunization recommendations and other problems. Increased surveillance efforts uncovered the limitations of serology-based diagnostic testing for mumps. This article summarizes the epidemiology of the recent outbreaks, the issues that arose during the public health response to them, and resulting changes in recommendations for mumps prevention and control.