The key U.S. derivatives exchange, CME Group, has announced plans to close its physical trading floor as a precautionary response to the Covid-19 outbreak.

The exchange will close its trading floor in Chicago after the close of business on Friday, March 13. Derivatives trading will continue on its CME Globex platform.

The decision to close the trading floor reflects efforts to stem the spread of the virus by reducing large gatherings.

The exchange said that there haven’t been any reported infections on the trading floor or in the Chicago Board of Trade building that houses it.

“The reopening of the trading floor will be evaluated as more medical guidance on the coronavirus becomes available,” CME Group said.