Northern Ireland: Link between narcolepsy and flu vaccine investigated
Health officials are investigating a link between narcolepsy and the Pandemrix vaccine in two people who were treated for swine flu.
Northern Ireland's Chief Medical Officer has confirmed to the BBC, that Northern Ireland had become the latest country to report suspected cases of the sleeping disorder.
Dr Michael McBride said the vaccine was used during the flu pandemic of 2009.
"Let's be clear - this is not the vaccine that we use today," he added.
Narcolepsy is a rare and chronic sleeping condition that may also cause muscle weakness.
Dr McBride said: "Two suspected cases have been reported to the Medicines and Healthcare Products Regulatory Agency. At this stage it is a precaution."
No details have been given about the people involved, including if they are children.