Seven St. Louis Cardinals players and six staff members have tested positive for COVID-19, causing Major League Baseball to postpone the team’s four-game series at Detroit.

The series was to have been played at Comerica Park from Tuesday through Thursday.

St. Louis has been in quarantine since Thursday in Milwaukee, where the Cardinals’ series last weekend was postponed, and the team is being tested daily.

The Cardinals are the second team sidelined by the novel coronavirus since the season started July 23. The Miami Marlins are set to resume play Tuesday in Baltimore.