And what else you need to know today.

Taking a test is the best way to assure yourself and others that you aren’t spreading the virus. Here’s what you need to know.

Lockdown, something experienced, dreaded and needed by much of the world in 2020, is Collins English Dictionary’s word of the year.

President Rodrigo Duterte of the Philippines has named as his national police chief an officer who drew public ire this year for violating pandemic restrictions.

At least three people who attended an election party at the White House last week, including the housing secretary and President Trump’s chief of staff, have tested positive for the coronavirus. Several hundred people gathered at the event in the East Room for several hours, many of them not wearing masks as they mingled and watched election returns.

As the virus surges throughout the United States, President-elect Joseph R. Biden Jr. has begun preparing for how he will manage the pandemic by naming several high-profile advisers — including a former surgeon general and a former Food and Drug Administration commissioner — and imploring Americans to wear masks.

The Food and Drug Administration has granted emergency authorization of a Covid-19 treatment made by the American pharmaceutical company Eli Lilly that was given to Chris Christie, the former New Jersey governor, when he was infected with the coronavirus.

Promising results from Pfizer’s vaccine trial.

In an agreement brokered by Russia, Azerbaijan won many of the concessions it has sought for decades in negotiations over the Nagorno-Karabakh separatist region.

The vote to remove President Martín Vizcarra comes amid a devastating coronavirus pandemic. It was unclear if he would acknowledge the vote as constitutional and step down.