Rob Manfred contends the MLB's health protocols are working despite outbreaks of COVID-19 on multiple teams.

"I think the vast majority of our players have done a really good job adhering to what are difficult protocols," Manfred said. "They're contrary to the way people normally live their lives.

"Relatively small deviations from the protocols can cause serious problems. That's a reality. ... Any individual act, you say, 'Wow, not a big deal,' but those individual acts can cause problems."

Manfred believes the outbreaks of the Marlins and Cardinals can be traced back to lapses in the protocols. 

"We believe, in the two serious outbreaks, that we can identify deviations from the protocols that resulted in the situations that we had," Manfred stated. "The key is vigilance. It's vigilance on the part of the commissioner's office, club officials, players and everyone involved in the game."