The highly contagious measles virus has been detected in a person within Lambton County.
Lambton Public Health (LPH) is reporting its first laboratory confirmed case of the year.
The health unit has followed up with all known contacts and exposures while further investigation is ongoing.
The virus spreads through the air when someone with measles breathes, coughs, or sneezes, and it can live for up to two hours in the air. Signs and symptoms of measles include fever, a red blotchy rash, red watery eyes, and Koplik (white) spots in the mouth.
Those who are most at risk of complications are under-immunized individuals who are infants under one-year-old, pregnant people, or anyone immunocompromised.
LPH said measles is prevented by a vaccine and those who have received a full schedule of a measles-containing vaccine, have previously been infected, or were born prior to 1970 are considered to be protected from infection.
If you think you or a family member has measles or may have been exposed, call your health care provider immediately.
If you have or develop symptoms, self-isolate at home.
Meanwhile, measles cases in Ontario have surged to the highest number in a decade.
Cases have also been detected in nearby Windsor-Essex, Chatham-Kent, Grey-Bruce, Huron Perth and Middlesex-London.