Commuters who travel on New Jersey Transit trains may have been exposed to the measles, state health officials said late last week.

The alert came Friday after a Hudson County resident with measles travel on the trains while potentially infected, the New Jersey Department of Health said.

Officials said the person infected had come into contact with someone with measles outside of the state and at this time there was no outbreak in New Jersey.

NJ Transit riders who traveled on these routes may have been exposed:

Anyone exposed to the measles while on the trains could develop symptoms as late as Sept. 11, health officials warned. They advised anyone who suspects a possible exposure to contact the health department or a health provider before going in person.

Measles first infects the respiratory tract, then spreads throughout the body, causing a high fever, runny nose, cough, red, watery eyes and a rash.

The rash generally appears three to five days after the first symptoms, beginning as flat red spots on the face and then spreading downward to the neck, trunk, arms, legs and feet. When the rash appears, the fever may spike over 104 degrees Fahrenheit, according to the CDC.

Most kids will recover from measles, but infection can lead to dangerous complications such as pneumonia, blindness, brain swelling and death.

There's no specific treatment for measles, so doctors generally try to alleviate symptoms, prevent complications and keep patients comfortable.