Whooping cough cases are on the rise in Canada, with some provinces reporting sharp increases compared to pre-pandemic averages.

More than 11,670 cases have been reported in Quebec so far this year, a significant jump from the annual average of 562 cases between 2015 and 2019.

The majority of whooping cough patients are between the ages of 10 and 14, a spokesperson for Quebec’s health ministry said in an email to The Canadian Press.

The last peak of whooping cough activity in the province was in 2019, when 1,269 cases were reported, the email said.

As of June, Ontario has seen 470 whooping cough cases, compared to the five-year average of 98, a provincial dashboard shows.