Coronavirus: What is a super spreader event?

WATCH: What is a super spreader event?

MEMPHIS, Tenn. — President Trump returned to work in the Oval Office Wednesday for the first time since his weekend hospital stay.

Meanwhile, the number of people in his inner circle who have tested positive continues to grow.

Health experts fear a ceremony last month to announce Supreme Court nominee Amy Coney Barrett may be a super spreader event. The September 26 event was packed with maskless guests who were not social distancing.

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A super spreader event is when a single person infects several others or an event is linked to a large number of COVID cases.

“It certainly is a potential high-risk event. Going in their favor it was outside, but all other factors not so great. People very close together and not wearing a mask,” said Baptist Hospital Infectious Disease Specialist Dr. Steve Threlkeld.

There was an indoor reception at the White House that day, too.

Since then more than 20 people who attended or had close contact with the president in the days after have tested positive for COVID. All this despite regular rapid tests for people around the President.

“Those tests can be falsely negative. So someone can have infection but not test positive,” said Threlkeld.

Threlkeld says people should not rely on only one procedure, but practice social distancing, wear masks and wash hands.

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