Contra Costa County health officials say fortunately there have not been any cases in the county this year. They're encouraging adults who aren't sure if they've had a second round to get one.
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RELATED: President Donald Trump urges vaccinations to prevent spread of measles
The measles, mumps and rubella vaccine needs to be stored in a refrigerator or freezer to maintain it's effectiveness. In Contra Costa County, there are extra doses on hand outside
of the clinics.
"It's very alarming," said Contra Costa County Health Officer Dr. Chris Farnitano.
Farnitano is encouraging parents to make sure their children are vaccinated at the one-year-old mark and again at five-years-old.
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"The measles vaccine is very safe, it's very effective and it's very important," said Farnitano.
RELATED: What is measles? What to know about measles symptoms, vaccine and treatment
For international travel with infants, Farnitano says health officials recommend an extra dose between six months and a year. That's in addition to the two later on.
Since two doses weren't always the standard, adults who aren't certain they received a second dose as a child are encouraged to get one now as an adult.
"If you're not sure you can always get an extra dose there's no harm in getting an extra dose," said Farnitano.
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As Los Angeles contends with an outbreak, university students who may have been exposed and are uncertain if they've been vaccinated are being asked to quarantine themselves.
A UCLA Spokesperson says there are 27 students quarantined, one on campus and 26 self-isolating in residences off campus.
RELATED: Health investigation into measles case at Google campus spans two counties
A person with measles can spread the disease to others even before they have any symptoms. Symptoms generally appear seven to 14 days after a person is infected and typically begin with a high fever, cough, runny nose and watery eyes. Three to five days after symptoms begin a rash breaks out.
Check out more stories and videos about the measles.