A staff works at an egg testing workshop of Sinovac Biotech Ltd., a Chinese vaccine-making company, during the production of a vaccine for the H1N1 flu virus in Beijing November 19, 2009. China has promised severe punishment for officials caught concealing deaths from H1N1 swine flu after a medical expert said suspect cases may have been held back by local governments. Picture taken November 19, 2009. REUTERS/China Daily
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