The Centre for Health Protection is investigating an influenza-like illness outbreak in a Tsuen Wan elderly home, affecting 21 residents.

The two men and 19 women, aged 59 to 103, came down with flu-like symptoms including fever, cough and sore throat from August 15. Of them, 11 sought medical treatment from private doctors or government out-patient clinics while 10 were stable in hospitals.

Nine patients were tested positive for Influenza A, but negative for human swine flu.

The centre has visited the institution and provided health advice. Tamiflu has been given to the staff and the patients' close contacts as preventive medication. The elderly home staff and residents are under medical surveillance.

The Department of Health meanwhile reports 333 newly confirmed cases of human swine flu today - 176 males and 157 females, aged from five months to 93 years.

This brings the total number of such cases to 10,089.