Updated at 3:28 p.m. ET

Ben Carson, the secretary of the Department of Housing and Urban Development, has tested positive for the coronavirus, as has David Bossie, a longtime Trump ally and campaign aide.

The news comes days after several other top Trump administration officials were also found to be infected with the virus.

"Secretary Carson has tested positive for the coronavirus," HUD deputy chief of staff Coalter Baker confirmed in an email to NPR. "He is in good spirits and feels fortunate to have access to effective therapeutics which aid and markedly speed his recovery."

NPR confirmed Bossie's condition with a source familiar with the matter who was not authorized to speak publicly.

Bossie had been coordinating events in battleground states as part of the Trump campaign's legal fight to contest the election. He traveled to Phoenix last week for one such event.

The two are the latest in a slew of high-ranking officials who have tested positive for the coronavirus, including President Trump and first lady Melania Trump. Mark Meadows, Trump's chief of staff, also recently tested positive.

Carson, 69, a retired neurosurgeon who has been a staunch supporter of the president, was treated briefly at Walter Reed National Military Medical Center in Bethesda, Md., according to ABC.

Like Meadows, Carson was at an Election Day watch party in the White House East Room, though it wasn't immediately clear if that might be where he became infected.

News of the positive tests came as President-elect Joe Biden reiterated his message of mask-wearing as a way to prevent the spread of COVID-19. Biden warned of a "very dark winter" looming, with the U.S. seeing record infections in recent weeks.

"A mask is not a political statement, but it is a good way to start bringing America back together," Biden said Monday. "The goal is to get back to normal as fast as possible."

Biden earlier Monday announced the formation of a 13-member Transition COVID-19 Advisory Board charged with drawing up a blueprint for responding to the pandemic.

Also on Monday, pharmaceutical giant Pfizer and its partner, BioNTech, announced that their experimental vaccine was more than 90% effective in preventing COVID-19 — news that sent shares on Wall Street into a sharp rise.

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