Vaccination is especially important if families have international travel plans since cases are mounting outside the U.S. as well.
Because the virus is so contagious, nine out of 10 susceptible people who are exposed will get measles.
Some people may have missed one or both doses.

Photo Illustration by Amelia Manley for Verywell Health; Getty Images
Who Does Not Need an MMR Vaccine?
These adults do not need a vaccination.
The test costs about $130 without insurance.
The vaccine could be free based on your income.
If youre unsure whether youve been vaccinated, you should first make a run at find your vaccination records.
If you do not have written documentation of MMR vaccine, you should get vaccinated.
Centers for Disease Control and Prevention.Global measles outbreak.
Centers for Disease Control and Prevention.Measles cases and outbreaks.
Centers for Disease Control and Prevention.Epidemiology and prevention of vaccine-preventable diseases: measles.