The U.S. has seen more cases of measles in the first four months of this year than it has experienced in nearly two decades.
Experts at the centers for disease control and prevention say 129 measles cases had been reported through April 18th.
Since then there’s been another suspected outbreak in an Amish community in Ohio.
Measles is one of the most contagious infectious diseases known — and it has not been eradicated in other parts of the world.
34 infected travelers have brought measles to the U.S. this year — which has triggered the rest of the cases among people who did not get the vaccine or who didn’t know their vaccine status.
Health officials say most doctors have never seen a case of measles which can increase the number of patients exposed to the virus before it is diagnosed.
Symptoms include high fever and rash that starts at the head and spreads to the rest of the body.