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Experimental H1N1 vaccine testing (AP Photo/Mark Humphrey)

A dose of the experimental vaccine for the H1N1 flu virus is prepared at Vanderbilt University Medical Center in Nashville, Tenn., Tuesday, Aug. 11, 2009. Volunteers are being given the vaccine to evaluate its safety and measure its ability to stimulate immune responses to the virus. (AP Photo/Mark Humphrey)

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Taken on August 18, 2009