A medical unit at Arbroath Infirmary is closed to new admissions due to a small number of patients who have flu like symptoms.
Patients in the unit are being monitored and appropriate infection control measures are understood to be in place.
A spokesperson for NHS Tayside said: “To help reduce the spread of infection, visitors are asked to avoid visiting if possible and asked to wash or gel their hands as usual. We ask that visitors who have coughs and colds which could be flu not to visit friends and relatives until they are better.
“The medical unit has been closed as a precaution and we are closely monitoring the situation.”