A study has found children in Britain who were vaccinated with a GlaxoSmithKline shot against H1N1 swine flu had a significantly increased risk of developing the rare sleep disorder narcolepsy.
The findings, which have not yet been published in full, are the first firm evidence in Britain that the flu vaccine, called Pandemrix, is linked to narcolepsy cases.
Research in Finland, Sweden and Ireland has already found clear associations.
Pandemrix was given to 30 million people - including around six million in Britain - during the 2009-2010 flu pandemic.
