A 75-year-old woman who received the human swine influenza vaccination has been admitted to Queen Elizabeth Hospital for lower limb weakness.

She developed bilateral lower limb weakness on February 8 and was admitted to the hospital the next day. She is now critical.

She received the jab on December 31 at a public outpatient clinic, more than five weeks before the onset of symptoms.

The Centre for Health Protection said tests indicate Guillain-Barre Syndrome. It will monitor her clinical progress and further laboratory results. The case will be reviewed by experts.

The majority of Guillain-Barre Syndrome cases temporarily associated with seasonal influenza vaccination occur between the second and the third week, with a median latency of 13 days.

According to the World Health Organisation, global experience so far shows the vaccination is not associated with increased incidence of Guillain-Barre Syndrome.