The New York Stock Exchange announced Wednesday that it would temporarily close its trading floor after several traders tested positive for coronavirus. The NYSE will move to all-electronic trading at market open on March 23.

“We implemented a number of safety precautions over the past couple of weeks, and starting on Monday this week we started pre-emptive testing of employees and screening of anyone who came into the building,” Stacy Cunningham, the president of the NYSE told CNBC. “If that screening warranted additional testing, we tested people and they were sent home and not given access to the building. A couple of those test cases have come back positive.”

The NYSE has previously shut down for four days following the 9/11 attacks and two days after Hurricane Sandy in 2012. The NYSE had also closed down for four months during World War I, starting in July 1914.

The coronavirus continues to impact the U.S. economy, devastating the travel industry and causing small businesses to shut down across the country to contain the spread of infection. President Trump has officially declared coronavirus a national emergency.

There are currently at least 7,769 cases of coronavirus in the U.S., according to Johns Hopkins University. The domestic death toll is at least 115.

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