As COVID-19 and other respiratory infections rise across the country, some major health systems are bringing back mask requirements to stop the spread of infections.

This week, Mass General Brigham, the largest health system in Massachusetts, said it will require masking for health care staff who interact directly with patients in clinical care locations starting Jan. 2.

Patients and visitors will be “strongly encouraged” to wear a facility-issued mask. Masks will not be required for staff in hallways and common areas.

The health system in a statement said its policy is based on the percentage of patients presenting to emergency departments or outpatient clinics with symptoms of respiratory illness.