Recently mumps has enjoyed a resurgence in the US with more than 6,500 cases reported in 2006. That's the largest out break in more than two decades. Scientists say most of the cases involved people who were vaccinated.
College students appeared especially vulnerable despite the fact they had received two doses of the vaccine as children.
Researchers with the Centers for Disease Control and Prevention are suggesting the mumps vaccine may need a tune up. They say the formula needs to be made more effective or people may need to receive an extra dose as young adults.
There's more on this topic in this week's New England Journal of Medicine.