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 (CHINA HEALTH SOCIETY) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA
REUTERS/CHINA DAILY