https://techcrunch.com/2020/03/16/canada-closes-border-to-all-foreign-nationals-except-americans-will-block-even-citizens-with-symptoms/

Canadian Prime Minister Justin Trudeau announced a number of additional measures being taken at a federal level in Canada to prevent further spread of coronavirus within the country. The most extreme is that Canada is closing its borders to non-citizens and anyone not holding permanent residence status, with the exception of U.S. citizens, though this won’t apply to commercial freight and cargo transportation necessary for doing business.

In addition to this border closure, all travellers, including Canadian citizens, who are exhibiting symptoms will be denied access when boarding flights, Trudeau said during a press conference on Monday.