Mumps Outbreaks Hit the US

CDC officials report almost half the cases of mumps reported so far in 2017 have occurred in Arkansas, while 90 cases of mumps have been reported in one city in Washington state alone.
1:38 | 01/27/17

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Transcript for Mumps Outbreaks Hit the US
All right and now to that health alert about mumps outbreaks across the country, at least 90 cases in one Washington city and the CDC says almost half the cases this year are in the state of Arkansas alone so Dr. Besser is here to talk about it. Dr. Besser, there's a vaccine against mumps so, you know, why are these outbreaks happening? It's a great question. If you get two doses of the vaccine it protects about 8% of people. It's not 100% effective. One dose only 78% so over time, there's a group of people that builds up who are at risk of this vaccine and you tend to see these outbreaks in crowded place, school, places where people are living closely and can share viruses. You know, the number of cases that have gone fivefold between 2015 and 016 but why is that as well. Yeah, in 2016 there were more than 5,000 case, 2015, about a thousand cases. You look at some of these other ye years, the chart, in the hundreds so people are wondering. There is a number of theories, one is that the virus may be changing. So that maybe the vaccine isn't as good as a match. The other, as people get older their immunity goes down and a third, maybe doctors aren't storing the vaccine properly. It has to be kept cold before you give it. If they don't it could be less effective but they haven't sorted that out. Remind us why should we worry about the mumps. For most people it's an annoyance, it's fever, it's body aches, it's swelling of your jaw. If you get it when you're older you're at risk of getting meningitis or encephalitis, deafness, could cause inflammation of the testes or ovaries. You want to reduce your risk as much as you can. Thanks for those symptoms. That midair emergency

This transcript has been automatically generated and may not be 100% accurate.

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