A single dose of MMR for Measles, Mumps, and Rubella at Kaiser Permanente East Medical offices on Feb. 3, 2015 in Denver, CO.
Joe Amon—Denver Post via Getty Images
By Alexandra Sifferlin
February 23, 2015
TIME Health
For more, visit TIME Health.

The number of measles cases in the U.S. has reached 154, according to new numbers released Monday.

Between Jan. 1 to Feb. 20, more than 150 cases in 17 different states have been reported to the Centers for Diseases Control and Prevention (CDC). The majority of these cases are tied to an outbreak linked to Disney California Adventure Park in Anaheim, Calif.

Some have blamed the latest outbreak on parents who don’t vaccinate their children for measles — or anti-vaxxers — and the CDC reports that the majority of people who got measles were unvaccinated. Travelers from other parts of the world where the disease is still prevalent could also be bringing it into the U.S., the CDC said.

There are currently three simultaneous outbreaks of the virus, the largest connected to Disneyland and the other two in Illinois and Nevada. In 2014, the U.S. experienced a major outbreak of measles that totaled 383 cases and was primarily spreading among an unvaccinated Amish community in Ohio.

Two doses of the measles vaccine (MMR) are nearly 100% effective at preventing the disease, which is highly contagious. The CDC recommends all children get their first dose of the vaccine at ages 12 through 15 months and the second dose at ages 4 to 6.

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