Mumps is an infectious infection that makes the salivary organs in the face end up swollen, according to the Centers for Disease Control and Prevention.
A vaccine for mumps is available and encouraged especially for children over the age of 1.
A spokesman from the state health department told the Dallas Morning News that the person traveled from another state. While there is no treatment for mumps, most people recover in a few weeks.
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Van Deusen told the Post there have been no reports of cases connected to the cheering event, but added that the "incubation period" is almost at its end. Infected people without symptoms of mumps may still be able to transmit the virus.
The CDC says the MMR vaccine is "very safe" and about 88 percent effective with two doses in your system.
Doctors recommend consulting your family physician to receive your vaccination status.
"Before the US mumps vaccination program started in 1967, mumps was a universal disease of childhood", the CDC points out on its website.
Texas Department of Health and Human Resources said while vaccination against mumps is the best protection against mumps infection, vaccinated individuals may still become infected. It also can be spread through shared utensils.