
Specialists at Beijing's Ditan Hospital were treating a 7-year-old girl infected with the virus, the city health bureau reported on its website, www.bjhb.gov.cn.
China is the first country to report human infections with the H7N9 virus.
The other 43 confirmed infections were in Shanghai and the nearby eastern provinces of Jiangsu, Zhejiang and Anhui.
Chinese health authorities and the World Health Organization have played down fears of an epidemic, saying there is no evidence of human-to-human transmission.//DPA