New figures released by the Centers for Disease Control and Prevention on Monday revealed that the number of measles cases in the U.S. has passed 150.
The majority of those who have contracted the disease were not given the MMR vaccine, which is almost 100 percent effective in preventing measles.
There have been 154 reported measles cases in 17 U.S. states. The majority of cases can be traced to the outbreak at Disneyland, Time reports. In addition to the Disneyland measles outbreak, Illinois and Nevada have seen outbreaks of the disease.