As measles cases keep appearing in more parts of the country, new projections suggest there’s a high chance Canada may experience a “sizable outbreak” — with anywhere from dozens to thousands of people infected if the disease strikes communities with low vaccination rates.

As of Friday, at least 31 cases of measles have been reported so far this year across Canada, according to a CBC News tally of provincial and regional figures released by public health teams.

That’s already the largest annual total since 2019 and more than double the number of cases reported last year, as medical experts fear the number will rise while more Canadians travel in and out of the country this month for March break.