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An epidemic prevention worker gets blood sample from a couple whose goslings died for uncertain reason in Shuimei Village in Chao'an County, south China's Guangdong Province, Sunday Feb. 1, 2004. The local governments forced sweeping slaughter and quarantine measures immediately and sent in related samples to the Harbin-based National Bird Flu Reference Laboratory after a suspected case of bird flu was found in the county on Saturday. No human infection has been found in the region. (KEYSTONE/AP Photo/Xinhua, Zhang Yiwen)