Derek Jeter: Some Marlins had 'false sense of security' before coronavirus outbreak

Per Nightengale, Jeter added that teams around the league should view Miami's situation as a warning for what could happen if personnel don't follow the guidelines on and off the field.

As of Monday afternoon, the Marlins are scheduled to begin a series versus the Baltimore Orioles on Tuesday. 

Reports surfaced on Monday that at least a couple of St. Louis Cardinals players visited a casino before the club's season was put on hold after over a dozen people associated with the team tested positive for the virus. The Cardinals haven't played since last Wednesday and may not face an opponent until this Friday at the earliest. 

While the NBA and NHL isolated teams inside bubble sites, MLB and the MLB Players Association are trusting that everyone involved with completing games will be on their best behavior as they travel around the country to compete at in-market ballparks. Both the Marlins and Cardinals offer proof of how quickly things can spiral out of control if players and coaches don't respect how rapidly COVID-19 can spread within a group.