No irregularities have been found so far with a hepatitis vaccine that was the subject of a complaint last week by an elderly man who felt ill after receiving a shot.
Centre for Health Protection controller Dr Thomas Tsang Ho-fai said the centre had sent officers to the Jockey Club Wo Lok Community Health Centre in Kwun Tong, where the man received the vaccination, to carry out preliminary investigation and collect samples of the vaccine for laboratory testing.
Preliminary findings show the shots had not expired.
The centre also contacted the manufacturer, which said it had received no reports of irregularities with the vaccine.
'We found the refrigerator in the health centre which keeps the vaccines was at a normal temperature,' Tsang said.
But the centre needed to wait for the results of laboratory tests and further surveillance before it could give a final conclusion, Tsang said.