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If someone receives the flu vaccine, there’s a better chance they’ll get through flu season without getting sick. But because the flu vaccine isn’t 100 percent effective, they might still end up infected despite the vaccine.
'He said: “Although in most winters, the vaccine is well matched, winter 2014-15 saw the circulation of a drifted H3 flu strain, making the vaccine less effective than the typical 50% we had seen in recent previous years. It is possible that this contributed to the increase in excess mortality.”' What an understatement as a less effective vaccine will lead to an increase in mortality, otherwise why have a vaccine in the first place, if this will have no effect.