In this photo taken on Saturday, Dec. 31, 2011, Ma Hanwu, vice director of Shenzhen Center for Disease Control and Prevention, right, speaks as Zhou Boping, director of the Shenzhen No. 3 People's Hospital looks at the documents during a press conference about a bird flu patient in Shenzhen in south China's Guangdong province. The strain of H5H1 bird flu that killed a Chinese man cannot spread among people, a health agency said Monday, appealing for calm after the country's first reported case of the disease in humans in 18 months. (AP Photo) CHINA OUT