According to the Centers for Disease Control and Prevention, 2019 now has the second greatest number of measles cases reported since the disease was eliminated in 2000.
The disease once claimed up to 500 lives in the United States each year.
But since the vaccine was introduced in 1963, deaths from measles in the US have plummeted.
However since April of this year, 387 cases of measles now been confirmed across the US.
Last week officials in Rockland County, New York declared a state of emergency.
More than 150 cases of measles have been confirmed there.
The outbreaks are linked to travelers who brought the disease back from other countries.
Measles is highly contagious and can spread through the air when an infected person coughs or sneezes or through direct contact.
Symptoms include high fever, rash, stuffy nose and red eyes.
While the symptoms can disappear on their own in a couple weeks, severe cases can lead to death.