The mess continues for the St. Louis Cardinals -- 13 members of the organization have tested positive for the coronavirus ... and the team's upcoming 4-game series with the Detroit Tigers has been postponed.
MLB confirmed ... 7 players and 6 staffers returned positive COVID-19 tests within the past week.
The team will remain in Milwaukee -- where they have been quarantined since Thursday -- until medical officials clear them to travel.
The Cards were supposed to play the Tigers at Comerica Park in Detroit beginning August 4th -- but now, that has been pushed.
The plan, according to MLB, is for the Cardinals to "resume its regular schedule on Friday against the Chicago Cubs in St.