The White House told staff in an email on Tuesday that it had completed "all contact tracing" for positive Covid-19 cases identified at the White House.
The email also urged anyone who hasn't been contacted and suspects they have had contact with someone infected to reach out to the White House Medical Office.
The email, reviewed by CNN, was sent to staff working across the White House complex, following revelations of new infections that include President Donald Trump and first lady Melania Trump, as well as many top White House advisers.
The West Wing had been reluctant to enforce any such regulations among staff, particularly with regard to masks, for fear of undermining the President's efforts to show that his administration has the pandemic under control.
But after several of the President's top aides, including Hope Hicks, press secretary Kayleigh McEnany and senior adviser Stephen Miller, tested positive in recent days, as well as other midlevel staffers, the White House has been forced to take rushed steps to prevent the spread from getting even worse.
38 min agoThe US could see as many as 400,000 Covid-19 deaths by this winter, Fauci predicts
From CNN's Shelby Lin Erdman
The United States could see as many as 400,000 deaths from the coronavirus this winter if Americans don't follow public health mitigation guidelines, Dr. Anthony Fauci warned on Tuesday.
Fauci had warned in the spring that if the US did not follow the guidance, 200,000 Americans could die from the deadly virus. “And sadly, we have 210,000 deaths now,” he said during a discussion with American University students.
- “The models tell us that if we do not do the kinds of things that we're talking about in the cold of the fall and the winter, we could have from 300,000 to 400,000 deaths. That would be just so tragic, if that happens.” -
Fauci encouraged everyone to take simple steps such as wearing masks, social distancing, frequent hand washing and doing as much outside instead of inside as possible.