The Dallas County Health and Human Services department confirmed 59 cases of mumps in the county thus far in 2017 Tuesday.
The majority of the infections have been identified among teachers and students at Cedar Hill (Texas) High School. The high school outbreak is now at 45 cases, an 18-case increase since March 2.
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Additionally, health officials have identified 14 mumps cases unrelated to the high school outbreak in the North Texas areas of Mesquite, Dallas and DeSoto.
"The increased number of mumps cases reported in the North Texas area underscore the importance of getting vaccinated," said DCHHS Director Zachary Thompson.
Two doses of the measles-mumps-rubella vaccine are 88 percent effective at preventing mumps, according to the CDC.
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