As of Thursday, about 39% of U.S. hospitals had announced vaccine mandates … The market for health care labor, strained by more than a year and a half of coping with the pandemic, continues to be pinched. While urban hospitals with deeper pockets for shoring up staff have implemented vaccine mandates, and may even use them as a selling point to recruit staffers and patients, their rural and regional counterparts are left with hard choices as cases surge again.