As reported by Gordon Wittenmyer of NBC Sports Chicago, the Cubs are one of three MLB teams not participating in a coronavirus antibody study being conducted to study the virus’s spread through metropolitan populations. The tests are not the same as those meant to detect the presence of the virus and are aimed at determining who has already been exposed and has recovered. MLB was chosen due to its nationwide presence and ability to quickly mobilize efforts, but not every team opted to participate.
The Cubs were one of those, though Wittenmyer reported that it was not a matter of team ownership or leadership opposing it in any way.