Montreal public health is warning that people may have been exposed to a contagious case of measles at Montreal–Trudeau International Airport on Friday and the Ste-Justine hospital’s emergency room on Saturday.

Public health says a child with a contagious case of the disease was at the airport from around 6:30 p.m. to just before 10 p.m. on Oct. 9 and would have gone through the international arrivals area, including passport control and the baggage claim area.

The same person was at the Ste-Justine ER on Oct. 10, from 6 a.m. until shortly before noon.