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Canada is shutting its borders to all travelers who are not citizens or permanent residents to help stem the spread of the coronavirus pandemic, Prime Minister Justin Trudeau announced Monday.

Exceptions will be made for flight crews, diplomats and immediate family members of Canadians — as well as, “at this time,” American citizens, Trudeau said outside his residence, where he is self-isolating after his wife, Sophie, tested positive for the virus.

“All Canadians as much as possible should stay home,” Trudeau added.

Anyone displaying coronavirus symptoms will be not permitted to board a flight to Canada — and airlines will be required to complete a basic health assessment of every passenger based on guidelines from the Public Health Agency of Canada, according to the CBC.

In addition, all international flights will be allowed to land only at the airports in Montreal, Toronto, Calgary and Vancouver for enhanced screening.

Beginning Monday, all arriving travelers will be asked whether they are experiencing symptoms such as coughing, difficulty breathing or fever. They also will have to acknowledge that they must self-isolate for 14 days if they’re arriving from abroad.

“I know that these measures are far-reaching. They are exceptional circumstances calling for exceptional measures,” Trudeau said.

“I know this news will spark concern among Canadians traveling abroad. I want to assure you that our government will not leave you unsupported,” he added.

“To help asymptomatic Canadians to return home, our government will set up a support program for Canadians who need to get on a plane. Canadian travelers will be able to get financial assistance to help them with the costs of returning home or temporarily covering basic needs while they wait to come back to Canada.”

There are about 375 presumptive and confirmed cases of the coronavirus in Canada, according to the CBC.