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Workers inspect labels on vials containing H5N1 flu vaccine during production at the Beijing-based drug manufacturer Sinovac Biotech Ltd. on Thursday, Nov. 24, 2011. (AP Photo/Andy Wong)
Photo by: Andy Wong
Workers inspect labels on vials containing H5N1 flu vaccine during production at the Beijing-based drug manufacturer Sinovac Biotech Ltd. on Thursday, Nov. 24, 2011. (AP Photo/Andy Wong)

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