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A view as the Baltimore Ravens play against the Washington Football Team at FedExField in October in Landover, Md. Photo: Patrick Smith/Getty Images

The NFL sent a memo to teams on Tuesday alerting them to stepped-up precautions against COVID-19, including on face masks and social distancing, the NFL Network first reported.

The big picture: As coronavirus cases surge across the U.S., the Baltimore Ravens placed seven defensive players on the reserve/COVID-19 list Tuesday following cornerback Marlon Humphrey's positive test. Under the new protocols, the NFL will require masks be worn during physical interactions postgame and is advising teams to ask players to wear face coverings on the sidelines and in locker rooms.

Go deeper: Most NFL games had fans this week

Go deeper

10 hours ago - Politics & Policy

California governor and family in quarantine after coronavirus exposure

California Gov. Gavin Newsom. Photo: Justin Sullivan/Getty Images

California Gov. Gavin Newsom (D) tweeted late Sunday that he and his family are quarantining after being exposed to COVID-19.

Details: Newsom said they learned Friday that three of his children had come into contact with a California Highway Patrol officer who tested positive for the coronavirus. "Thankfully, the entire family tested negative today," Newsom said.

Updated 7 hours ago - World

Oxford University says its coronavirus vaccine is up to 90% effective

A scientist working during at the Oxford Vaccine Group's laboratory facility at the Churchill Hospital in Oxford, England, in June. Photo: Steve Parsons/Pool/AFP via Getty Images

The University of Oxford announced Monday that a COVID-19 vaccine it's developed with AstraZeneca is 70.4% effective in preventing people from developing symptoms, per interim data from Phase 3 trials.

Why it matters: The Oxford-AstraZeneca vaccine is shown to work in different age groups and can be stored at fridge temperature. It is much cheaper than other vaccines in development and is part of the global COVAX initiative, designed to ensure doses go where they're most needed.

Operation Warp Speed leader: COVID vaccine push is "isolated from a political environment"

Moncef Slaoui in the Rose Garden on Nov. 13. Photo: Mandel Ngan/AFP via Getty Images

Moncef Slaoui, the White House's top scientific adviser to Operation Warp Speed, told Chuck Todd on "Meet the Press" on Sunday that the Trump administration's efforts to accelerate the development of a coronavirus vaccine is "isolated from a political environment" and that a change in administration "doesn't, frankly, make a difference" on its efficacy.

Why it matters: Slaoui told ABC's George Stephanopoulos on Sunday that he has not yet had contact with Joe Biden's transition team, as the president-elect prepares to inherit one of the country's biggest crises ahead of an expected vaccine distribution effort that would require massive logistical cooperation between states and the federal government.