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Warnings rise for US as severe flu strain H3N2 causes outbreaks in Canada, UK

By NBC News  
   November 13, 2025

As flu season gets underway, global health experts are increasingly worried about a new strain of the virus that popped up in June — four months after the makeup of this year's flu shots had been decided. The new strain, a version of H3N2, is causing outbreaks in Canada and the U.K., where health officials are warning about the early wave that's sending people to the hospital.

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