H1N1 vaccine linked to risk of narcolepsy

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A vaccine designed to combat the influenza virus known as swine-flu has been linked to an increased risk of narcolepsy in patients between the ages of 21 and 30, according to a study from Sweden.

Researchers at the Karolinska Institutet in Stockholm were examining the vaccine Pandemrix, created in 2009 to fight the H1N1 virus, for associations with neurological or immune diseases. After a population-based study, comprising 62 percent of the Swedish population, they found an association between the vaccine and an elevated risk of narcolepsy in young adults and children.

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