Ko Wing-man, Secretary for Food and Health. Photo: Felix Wong

Ma Xiaowei (centre) vice minister of National Health and Family Planning Commission of China, and Ding Yitao (left) head of Nanjing Gulou Hospital, talk at the hospital entrance after Ma's visit of the hospital in Nanjing, Jiangsu province, late on Friday evening. Photo by Simon Song

Authorities began culling birds at a major wholesale market in Shanghai on Friday. Photo: EPA