The Centers for Disease Control and Prevention reported Tuesday that 107 people from 21 states, including states bordering Virginia, have reported contracting the measles.
According to the CDC, there have already been 107 measles cases reported this year.
Most of the people who got measles had not been vaccinated, the CDC said.
This year is on track to become one of the worst years for measles in the last decade.
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The Florida Department of Health said Monday it is investigating a case of measles in an unvaccinated child in Pinellas County.
The CDC says symptoms generally appear about seven to 14 days after a person is infected and can begin with a high fever, cough runny nose and red, watery eyes.
There were 118 cases in 2017, and only 86 the year before that. "One dose of MMR vaccine is 93% effective against measles, 78% effective against mumps, and 97% effective against rubella".
The total number of cases per year in the U.S. usually hovers around 100, aside from 2014 when an outbreak led to 667 cases.
Dr. Ann Hennessey, a pediatrician with Mercy Clinic, has encouraged all of her patients to get vaccinated. He said measles is contagious and can even send people to the hospital. "However, they are more likely to have a milder illness, and are also less likely to spread the disease to other people".