The Center for Disease Control is monitoring cases of measles in 21 states, including California.
The 2018 mid-year shows that there have been 107 cases so far this year. That number on track to surpass the 118 cases last year.
Director of Disease Control at Kern County Public Health Denise Smith says that the numbers aren't highly concerning yet because they were isolated incidents.
Smith says that measles are highly contagious. Symptoms include a cough, high fever and rash.
According to the CDC, if one person has the disease, nine out of 10 people around them will become infected.
Smith wants to make sure everyone understands the importance of getting vaccinated.
The CDC report says that the majority of people who got the measles were unvaccinated.
The MMR vaccine is 93% effective at preventing measles and two does is 97% effected -- according to the CDC.