>Nursing homes should be isolated together with some of the staff until other staff who have acquired immunity can take over

Just this one sentence has a lot to unpack. How do we know that a staff member immune to COVID? My understanding is that an antibody test is correlated but not necessarily indicative of immunity. What does this mean for staff members that aren't immune? Will they be furloughed indefinitely or fired? Should there be financial incentives to deliberately infect yourself?