Niagara Public Health is investigating a confirmed case of measles in Niagara and is warning anyone who may have been exposed to watch for signs.

Public Health said Friday night there is a laboratory confirmed case of measles in an adult who caught the infection while travelling outside Canada.

The agency is asking anyone who was in the West Lincoln Memorial Hospital emergency room or first floor X-Ray unit in Grimsby on Feb. 27 between the hours of 3 p.m. and midnight to watch for signs and symptoms. They should also ensure their vaccinations are up to date as they may have been exposed to measles.

Other exposure locations were five days earlier on Feb. 22 on flights that came through Toronto Pearson International Airport and airports in Cambodia and China.

They include:

-Departing Flight, Siem Reap, Cambodia on Cathay Pacific Flight #5249 at 11:20 a.m.

-Arriving Flight, Hong Kong, China, Cathay Pacific #5249 at 3 p.m.

-Departing Flight, Hong Kong, China, Air Canada #16 at 4:30 p.m.

-Arriving Flight, Toronto Pearson International Airport, Terminal 1, Air Canada #16 at 6:20 p.m.

-Toronto Pearson International Airport 6:20 p.m. to 9:30 p.m.

Public health said measles start with a cough, runny nose, red watery eyes and fever. A rash begins on the face after about four days and moves down the body and there may be white spots inside the mouth.

Anyone who thinks they may have measles and need to see a doctor is being asked to call ahead to the doctor's office, walk-in clinic or emergency department so staff can make appropriate arrangements. They must not show up unannounced.

Measles easily spread from person to person.

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All residents are urged to have their vaccinations up to date. More information about measles and public health clinics can be found on the public health website at niagararegion.ca/health.

This past Tuesday, Toronto Public Health said it was investigating a confirmed case of measles in an infant, not old enough for a measles vaccination, who had recently returned from overseas travel.