H7N9 avian flu

H7N9 refers to a subgroup of H7 influenza viruses that normally circulates among birds. Human infections of H7N9 have been reported in parts of China, with some people dying of severe pneumonia.

Dead sparrows lie on the ground in a residential area in Nanjing, east China's Jiangsu province. Photo: AFP

Online pictures of dead birds spur China flu openness

Photos of 10 dead sparrows on a Chinese pavement that went viral on social media and drew a swift official response show how hard covering up a bird flu outbreak would be in the internet age.