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GENEVA (AP) - The World Health Organization said Friday it is investigating samples of variant swine flu linked to two deaths and one severe case in Norway, but that so far the significance of the mutation is unclear.
Norway's Institute of Public Health announced Friday that the mutation "could possibly...cause more severe disease" because it infects tissue deeper in the airway than usual.
The mutation was found in three of 70 analyzed swine flu cases, said Geir Stene-Larsen, the institute's director.
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