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Prime Minister Justin Trudeau during an August news conference on Parliament Hill in Ottawa, Canada. Photo: Dave Chan/AFP via Getty Images

Prime Minister Justin Trudeau said during a televised address on the coronavirus pandemic Wednesday that for Canada's four biggest provinces, "the second wave isn’t just starting, it's already under way."

Driving the news: Daily case numbers have gone from roughly 300 cases a day in mid-August to 1,248 by Tuesday, with most outbreaks in British Columbia, Alberta, Ontario and Quebec, CBC notes. "We're on the brink of a fall that could be much worse than the spring," Trudeau said. "It's all too likely we won't be gathering for Thanksgiving, but we still have a shot at Christmas." Over 147,700 Canadians have tested positive for COVID-19.

Go deeper

Dec 31, 2020 - Health

WHO lists Pfizer COVID-19 vaccine for emergency use

A healthcare worker giving a patient a dose of Pfizer-BioNTech's coronavirus vaccine in Florida on Dec. 30. Photo: Marco Bello/Anadolu Agency via Getty Images

The World Health Organization on Thursday listed Pfizer-BioNTech's COVID-19 vaccine for emergency use.

Why it matters: The approval — the WHO's first for a coronavirus vaccine — may allow some countries to expedite their own regulatory approval processes so they can import and administer the vaccine quicker, the WHO said.

Updated 34 mins ago - World

Mexican President López Obrador tests positive for coronavirus

Mexico's President Andrés Manuel López Obrador during a press conference at National Palace in Mexico City, Mexico, on Wednesday. Photo: Ismael Rosas/Eyepix Group/Barcroft Media via Getty Images

Mexican President Andrés Manuel López Obrador announced Sunday evening that he's tested positive for COVID-19.

Driving the news: López Obrador tweeted that he has mild symptoms and is receiving medical treatment. "As always, I am optimistic," he added. "We will all move forward."