"Many members of the House community were in protective isolation in [a] room located in a large committee hearing space," Dr. Brian Monahan said, adding, "During this time, individuals may have been exposed to another occupant with coronavirus infection."
He advised members to keep up their "usual daily coronavirus risk reduction measures," such as social distancing and symptoms checks. He said they should also get tested for the virus as a precaution.
Members of Congress were rushed into secure locations after supporters of President Donald Trump breached the Capitol building in an attempt to disrupt Congress' tally of the Electoral College votes and confirmation of President-elect Joe Biden's win.
A hearing room where many members were sheltered featured inconsistent mask-wearing and social distancing. Videos posted to social media show several members of Congress without masks in the crowded room.
The Covid-19 pandemic is still raging across the U.S. even as vaccines begin to become available. So far, there have been more than 22 million confirmed cases in the U.S. and more than 373,000 deaths.
Over 50 members of Congress have tested positive for the virus, according to an NBC News count.