A type of flu jab has been linked to an increased chance of narcolepsy in people under 20, but it has been given to millions of children and teenagers in the UK.
The European Medicines Agency has warned that children and teenagers should only been given Pandemrix as a last resort if other vaccines for the H1N1 strain of flu are unavailable after they made a connection between the rare sleep disorder and taking the drug.
Studies from Finland and Sweden suggested that there is a six to 13-fold increased risk of a child or adolescent developing narcolepsy, which causes a person to fall asleep without warning, if they have been vaccinated with Pandemrix compared with those who hadn’t been given a vaccine.
The overall risk benefit of Pandemrix is otherwise positive.
The EMA said that Pandemrix has probably interacted with genetic or environmental factors, which may have contributed to the increased risk of narcolepsy, and other factors may have also had an impact.