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  Flu vaccines are a generally sensible precaution but ARE NOT 100% effective and no one has ever suggested they are.
  
  Each years flu vaccine is made from the predominant strain of flu circulating in the winter months in the opposite hemisphere. Given the rate at which vaccines mutate this is why scientists estimate that in most years flu vaccines have a 70% effectiveness rating i.e. even having the jab means you still have a 30% chance of getting flu, though in these cases it is likely to hit one less hard.
  
  It is therefore sensible if you are in a high risk group to get the jab.
  
  This was all rather beautifully explained yesterday morning by a university prof on Radio4

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