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    Examiner

    Shot in the arm

    Does the start of flu season have you on pins and needles? Take a look at the numbers.

    Sources: US Centers for Disease Control and Prevention, flu.gov, Massachusetts Department of Public Health, healthmap.org; illustration from iStockphoto

    To see the graphic, click here.

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    Due to a reporting error, an earlier version misstated the number of virus strains in this season’s flu vaccine; it is three or four.