On Oct. 29, 2024, the BC Centre for Disease Control announced that travellers were alerted to potential exposure to measles on flights to and from the Vancouver International Airport (YVR). A passenger with measles arrived at the airport in Vancouver on October 16 and departed on another flight that evening.

People who were on the same flights or who were at YVR during this time may have been exposed. The passenger then flew from Toronto Pearson International Airport to Fredericton International Airport in New Brunswick. The passenger later tested positive for measles in New Brunswick.

Measles is highly infectious and transmitted by airborne spread but most people are immune to it thanks to immunization or natural infection. People born before 1970 or people who have had measles as a child are also immune. People who are most at risk of infection are those who are completely unvaccinated against the disease, including children under one year of age.