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In this photo provided by Duke Medicine, Duke employee health nurse Janet C. Stolp, center, gives a flu vaccination during Duke University Hospital’s second annual flu vaccination blitz in Durham, N.C., on Wednesday, Sept. 19, 2012. Duke is hoping to vaccinate 10,000 health-care workers at both its hospitals as a way to protect both staff and patients, whose weakened immune systems make them especially susceptible to infection.

Duke Medicine / AP Photo