Those who are quarantined must provide immunization records or undergo a blood test to prove immunity.
In most cases, the measles causes fever, runny nose, cough and a rash all over the body, according to the Centers for Disease Control and Prevention. The measles can cause rare, but serious complications such as pneumonia and a dangerous swelling of the brain.
As of Wednesday, the number of confirmed measles cases in the United States is at its highest -- 695 -- since the disease was declared eliminated from this country in 2000, according to the CDC.
The CDC recommends the vaccine for everyone over a year old, except for people who had the disease as children.