Thirteen patients from Castle Peak and Tung Wah Hospitals and a Pamela Youde Nethersole Eastern Hospital staff member have come down with diarrhoea or vomiting, the Hospital Authority says. Some have tested positive for Norovirus.

The six women, aged 19 to 65, and seven men, aged 48 to 85, are being treated in isolation while the staff member is on sick leave. Their condition is stable.

Infection control measures have been stepped up. The cases have been reported to the authority's Head Office and Centre for Health Protection.