A sign lets customers know they can get a flu shot in a Walgreen store in Indianapolis in this Sept. 16, 2014, file photo. (AP Photo/Darron Cummings) ** FILE **
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A sign lets customers know they can get a flu shot in a Walgreen store in Indianapolis in this Sept. 16, 2014, file photo. (AP Photo/Darron Cummings) ** FILE **
