Measles is a very serious and highly contagious illness that can cause severe complications, including pneumonia, encephalitis (inflammation of the brain) and even death.
Since the introduction of the measles vaccine, rates of measles infections have dropped significantly in Canada and around the world. However, measles cases have increased as immunization rates have declined. Most measles cases occur in unimmunized people, including visitors to Canada or those who have traveled to areas where measles is a concern. Getting immunized is the best way to protect against measles. When you get immunized, you help protect others as well.
People who are unimmunized are at risk of measles. Young children, people who are pregnant and people who are immunocompromised are most at risk of severe illness and complications.
Who is at risk?
You are at risk of getting measles if:
- You have never had measles
- You have not been immunized against measles
People who have not had measles should receive 2 doses of a measles-containing vaccine after 12 months of age to be protected. People born before 1970 are assumed to be protected from infection as measles circulated widely then.
How measles spreads
Measles is very contagious and spreads easily. When an infected person breathes, coughs, or sneezes, the virus spreads through the air. The measles virus can survive in small droplets in the air for several hours. You can become infected when you breathe in these droplets or touch objects contaminated with the virus. The airborne spread of the measles virus makes the disease very contagious. Sharing food, drinks or products that produce smoke (for example, cigarettes) or vapours (for example, e-cigarettes), or kissing someone who has the virus can also put you at risk.
Symptoms of measles
Symptoms of measles include fever, cough, runny nose, and red and inflamed eyes that are often sensitive to light. These symptoms are followed by a rash, which starts first on the face and neck, and spreads to the chest, arms and legs. The rash lasts about 4 to 7 days. There may also be small white spots inside the mouth.
Symptoms can start as soon as 7 days after a person is infected with the measles virus.