World needs to update its flu vaccines: study

(Reuters) - As Americans line up for flu shots, they should consider that the vaccines may be far less effective than thought, according to a new study.

Source: http://feeds.reuters.com/~r/reuters/healthNews/~3/6mG9hWDKCpY/us-vaccines-lancet-flu-idUSTRE79O8YV20111025

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