Mumps is a contagious disease caused by a virus that spreads from person to person through saliva and mucus.
"What we've seen -- as in other parts of the country, (it's) really just the same thing -- a pretty big resurgence in mumps cases over the last six or eight months," said Chris Van Deusen, spokesman for the state's health services department. In 2016, Texas experienced 192 mumps cases, he said, primarily in the last few months of the year.
Mumps typically begins with fever, headache, muscle aches, tiredness and loss of appetite lasting a few days, according to the US Centers for Disease Control and Prevention. Most people will have swelling of the salivary glands, causing puffy cheeks and a swollen jaw. Generally, symptoms last at least two days but no more than 10 days.
Because it is caused by a virus, mumps does not respond to antibiotics. Doctors generally recommend bed rest and over-the-counter pain relievers.
"We have largely seen outbreaks in North Texas, so the Dallas-Fort Worth area and some of the surrounding counties," Van Deusen said, adding that Dallas County has experienced two or three significant outbreaks.
"We've had quite a large one with, counting last year and this year, more than 150 cases in Johnson County, which is just south of Fort Worth," he said. "We've certainly seen cases in other areas of the state, but those have been where the largest outbreaks have been centered."
An outbreak in Johnson County, in particular, included 189 cases spanning last year and this year among children and a couple of college students, he said.
"There have been people who have traveled back and forth between (Johnson County) and Northwest Arkansas, where they've been seeing much of the activity, so it seems to be linked to that outbreak," Van Deusen said.
An outbreak of mumps began in Arkansas in August, explained Dr. Dirk Haselow, Arkansas' state epidemiologist. Between August and April 13, Arkansas reported 2,930 cases, he said. (Similarly, Washington state (PDF) has been hard hit by the mumps, reporting 611 confirmed and probable cases during 2017.)
"We've had less than 500 cases this year," said Haselow, who believes his state is at the tail end of its outbreak. "Thankfully, the number of cases we've had each week decreased recently. We've only added 14 cases in the last three weeks." At the height of the outbreak, nearly 50 cases a day were reported across 35 counties. Today, only four counties are experiencing infections.
As for a possible spread from his state to Texas, Haselow has no doubts.
"Mumps has a long incubation period, as long as 26 days between exposure and symptoms, so people could have been exposed, you know, a little over a month ago, and now you have new cases with that association," he said.
Across the nation, most mumps cases are occurring among people who have been vaccinated, according to the CDC, and these outbreaks are not due to low vaccination rates. For example, in Texas, 97.6% of kindergarten-age children have received two doses of the measles-mumps-rubella vaccine, Van Deusen said, while 98.7% of seventh-graders have.
The CDC recommends that children get two doses of the MMR vaccine. One dose is considered about 78% effective initially (PDF), and two doses are about 88% effective. So even if you are vaccinated, you need to practice primary prevention.
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