Masking is now required in all clinical areas at the Calais Community Hospital, officials announced Wednesday.
Hospital officials cited a major increase in respiratory illnesses among patients and staff, and a continued rise in respiratory illnesses within Washington County.
The directive applies to the emergency, inpatient, laboratory, radiology, surgery and respiratory departments.
Masks are optional in areas considered low-risk to more vulnerable patients, including the cafeteria, main lobby and hallways.
Hospital officials said they plan to reassess by the end of the week to determine next steps.