The new coronavirus has spread across Canada with a total of 313 cases confirmed Sunday in its 10 provinces, the chief public health officer told a news conference.

Atlantic coast provinces were the last to be hit. Major metropolitan centres -- Toronto, Montreal and Vancouver -- remain the most affected.

"I'm asking everyone to take strong action to prevent the spread of the virus," chief public health officer Theresa Tam said, warning that a window of opportunity to mitigate its spread was "quickly narrowing."

Measures must include, she said, limiting travel and self-isolating for 14 days upon returning from a trip abroad, as well as avoiding large crowds, practicing "social distancing" and working from home, if possible, over the coming weeks.

After a meeting of Prime Minister Justin Trudeau's cabinet, ministers said to expect more actions to be announced yesterday.

Canada has tested nearly 25,000 people -- among the highest per capita rates in the world. The number of positive test results jumped from a few dozen just last week, including one death.

"Most of the cases (in Canada) have been linked to travel," Tam said, "but that could change very quickly."