St. Paul's Hospital in Saskatoon is closed to visitors as the facility tries to contain an outbreak of a stomach virus.
Hospital officials put the measure in place Thursday, when additional cases of diarrhea and vomiting among patients and staff were reported.
The hospital had already closed two units to visitors, earlier in the week, over confirmed cases of the Norovirus.
It was not known if the latest cases were the same virus, but the symptoms are consistent with that.
While the building is closed to visitors, people who are scheduled for day surgeries or day procedures may still keep their appointments.
Urgent and emergency surgeries were also proceeding.
The hospital urged people to only go to the emergency department for true emergencies.
They added that people with extraordinary needs to visit, such as a palliative family member, should contact the nursing unit to determine what to do.