Aren't there MLB guidelines that the players are supposed to follow?
It's interesting listening to PGA players and their caddies talk, they all sound like they are being very cautious as they want to avoid missing a couple weeks. Golf is every man for himself and their living depends on playing tournaments.
You'd think though, that there would be some notion of avoiding higher risk activities for the sake of not hurting your team. Maybe if the games were forfeited and players docked pay if they catch the disease by breaking an agreed upon protocol, there would be better compliance.