Health authorities say they are investigating a travel-related laboratory-confirmed case of measles in York Region north of Toronto.
York Region Public Health has identified three places where people may have been exposed to the disease, while correcting the name of one of the locations:
Anyone who visited these areas during the specific times listed may be at risk and should consult a doctor.
Measles is extremely contagious and is spread through airborne particles. Symptoms can appear between seven and 18 days after contact with an infected individual and may begin with a cough, runny nose, fever, red watery eyes and small spots with a white centre inside the mouth.
A red, blotchy rash appears on the third to the seventh day.
"York Region Public Health has been working closely with our partners at these various locations where the measles exposures occurred," the agency's Scott Chowela told NEWSTALK1010 Friday afternoon.
"[We're working] to ensure that staff, patients and attendees are aware of the measles exposure, and are adequately protected against measles through immunization or confirmation of immunity through lab testing," Cholewa added.
"It is important to identify measles early to help prevent its spread to other people."
- With files from Dave Bradley, Claude Feig and Jackie Rosen