Students at one Dallas County school will be offered a free booster shot because of a mumps outbreak.
Health officials said at least 23 students and staff members from Cedar Hill High School, south of Dallas, have the mumps. The health department is also looking into nine other cases.
All of the diagnosed students were vaccinated, but Dallas County Health and Human Services said the vaccine is only 88 percent effective after two doses.
The health department is now recommending that everyone at the school get a third booster dose of the MMR vaccine. Workers will set up a clinic at the school Friday to offer students and staff free booster shots.
Mumps can spread as an infected person coughs, sneezes or shares food. Symptoms are similar to the flu and include fever, headaches, swollen salivary glands, fatigue, muscle aches and a loss of appetite.
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