FREDERICK, Md. (AP) — The operator of Frederick Memorial Hospital is threatening to fire 14 workers who refused to get flu shots.

The Frederick News-Post reported Friday that the Frederick Memorial Healthcare System told the hospital’s 2,800 workers during the summer that they had to get the free shots.

The policy also applies to volunteers, physicians and contractors. It’s aimed at protecting patients, workers and their families.

Employee Health Manager Barbara Christoff says the deadline for getting shots is Friday. Workers who don’t comply could be terminated on Monday.

Christoff says 52 employees have been granted exemptions for health or religious reasons. She says they must wear protective masks within 6 feet of patients during flu season.

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