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"We have real and grave concerns about these sudden changes to the Pfizer vaccine regime," the Doctors' Association UK said on Thursday.

"It may seem tone deaf for a company to lead FAANG for three straight years, but I think that in fact will happen," Gene Munster said of Apple.

"It has been determined that this was an isolated incident," Julie Miller, an administrator for the Boone County Health Department, told CNBC by email.

December was the deadliest month for America during the pandemic. Yet President Donald Trump barely uttered a word about Covid-19's tragic toll.

States and counties need more resources to accelerate the pace of vaccination, Fauci said.

"Our main advantage is that we have a centralized health-care system," said Eran Segal, a computational biologist in Rehovot, Israel.

Mayor Bill de Blasio said the city will use schools, pop-up clinics and "whatever it takes" to reach 1 million people within the month.

The stock market is poised to wrap up a tumultuous 2020 with surprisingly strong gains.

A handful of states allow big winners to remain completely anonymous. In others, if you plan ahead, you may be able to shield your identity.

These are the stocks posting the largest moves before the bell.

As 2020 draws to a close, CNBC Make It looks at some of the major breakthroughs achieved this year and the positive shifts they foretell for 2021 and beyond.

California Gov. Gavin Newsom told Dr. Anthony Fauci Wednesday that the state has identified its first case of the new and more infectious strain of Covid-19.

"If we have to make new vaccines, we can make them now that we've done the initial work," Sir John Bell of Oxford University told CNBC.

"We agree that that number is lower than what we had hoped for," Moncef Slaoui, chief advisor of Operation Warp Speed, said Wednesday.

The new variant "could lead to more cases and put even more strain on our already heavily burdened" hospitals, the CDC's Dr. Henry Walke said.

In an effort to stave off bankruptcy, AMC has made an additional 50 million shares available for sale.

On Tuesday, Colorado health officials confirmed the nation's first case of a new and potentially more infectious strain of Covid-19.

The Carolina Panthers offensive linemen agreed to have roughly $6 million of his salary diverted to mobile payment company Strike to purchase bitcoin investments.

New York Gov. Andrew Cuomo will hold a press briefing on the coronavirus Wednesday as the state reportedly searches for more hospital capacity.

The company's new owners are seeking a new leader after the legacy retailer emerged from bankruptcy.