Subsequent studies, including our own, have demonstrated this strong association between Pandemrix and narcolepsy. The vaccine has been associated with a two-to twentyfold increased risk of developing narcolepsy. But this marked increase in cases has not been seen with the other commonly used H1N1 vaccine. The reason for this is not entirely understood, although there are subtle differences between the two vaccines, in the nature and quantities of the viral fragments contained. Studies have shown that the chemical structure of fragments of the H1N1 virus are very similar to bits of the
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