Liu Yaqing, deputy director of Beijing Municipal Bureau of Agriculture, speaks during a press conference in Beijing, capital of China, April 13, 2013. A seven-year-old girl in Beijing was infected with the H7N9 strain of bird flu, the first such case in the Chinese capital, local health authorities said Saturday. (Xinhua/Li Wen)

Zhong Dongbo, deputy director and spokesman of Beijing Municipal Health Bureau, speaks during a press conference in Beijing, capital of China, April 13, 2013. A seven-year-old girl in Beijing was infected with the H7N9 strain of bird flu, the first such case in the Chinese capital, local health authorities said Saturday. The case was confirmed following a test by the Chinese Center for Disease Control and Prevention early on Saturday. The child is being treated at the Beijing Ditan Hospital, and is in stable condition. (Xinhua/Li Wen)

Journalists raise questions about the first case of H7N9 infection in Beijing at a press conference held in Beijing, capital of China, April 13, 2013. A seven-year-old girl in Beijing was infected with the H7N9 strain of bird flu, the first such case in the Chinese capital, local health authorities said Saturday. The case was confirmed following a test by the Chinese Center for Disease Control and Prevention early on Saturday. The child is being treated at the Beijing Ditan Hospital, and is in stable condition. (Xinhua/Li Wen)