A four-month-old boy died after being found unconscious at home in Sha Tin yesterday.
The death of the infant, surnamed Tse, came less than 24 hours after he was vaccinated in a government health centre on Monday. But a doctor said it was 'highly unlikely' that the death was caused by the vaccine.
Initial investigation showed that he suffered fever and was then fed with medicine at night, according to police.
The baby had earlier received a DTaP-IPV vaccine, which is part of the childhood immunisation programme established in Hong Kong.
Yesterday, his 24-year-old mother, surnamed Lee, found the infant unconscious in bed in the family's flat in Mei Lok House, Mei Tin Estate and called police at 5.23am. The baby was taken to Prince of Wales Hospital, where doctors declared him dead.
Police said there were no signs of suspicious circumstances. A postmortem examination will be carried out.