Alberta Health Services (AHS) warns the public of a laboratory-confirmed measles case in the Calgary area, adding that citizens may have been exposed.

On Tuesday evening, the Health Services said that a person with a lab-confirmed case of measles was present in public places while infectious.

The agency added that the infected person was on Air Canada flight AC206 from Vancouver on November 23, where the flight landed in Calgary at 12:45 PM. The patient then spent two and a half hours in the domestic arrivals area at Calgary International Airport.

The patient then went to the emergency room at Alberta Children's Hospital at 4 PM on November 24, where they spent five and a half hours in the waiting room before leaving.

AHS said the patient returned to the hospital on November 27 at 1:15 PM and spent an additional three hours in the waiting room.

Health officials also said the patient is now under observation, but anyone who was in the aforementioned areas during the specified times should take necessary precautions.

AHS said in a statement: "Anyone who attended these sites at these times is strongly encouraged to review their immunization records and contact HealthLink 811 for advice." "Anyone who attended these sites at these times, who was either born after 1970, or has fewer than two documented doses of a measles-containing vaccine, may be at risk of contracting measles."

Anyone showing measles symptoms, which include a fever of 38.3°C or higher, cough, runny nose and/or red eyes, and a red rash appearing between three to seven days after the fever, should stay home and contact 811 for advice instead, or visit their healthcare provider.

External Health Services said: “Measles is a highly contagious disease that spreads easily through the air. There is no cure for measles, however, it can be prevented through vaccination.”

Measles vaccination is offered free of charge to Alberta residents, and is usually given first to children at 12 months of age, with a second dose given between ages four and six.

AHS said anyone who believes they may have been exposed to this measles case may also be able to receive vaccinations.