Thirteen students and eight staff of a Tai Po special school have come down with respiratory tract infection symptoms, the Centre for Health Protection says.

The seven males and 14 females came down with a fever, cough, runny nose and sore throat September 4 to 9.

Eleven sought treatment from private doctors or government out-patient clinics. Two others were admitted to Alice Ho Miu Ling Nethersole Hospital and are stable. One tested positive for respiratory syncytial virus.

Centre officials have visited the school to provide health advice. Investigations are underway.