Figures released to the BBC show the virus has led to the death of about 208 million birds around the world and at least 200 recorded cases in mammals. "Dr Wenqing Zhang, the head of WHO's global influenza programme, said of the threat posed by the virus spilling over: "It is very concerning and the risk has been increasing over the years as reflected in the number of outbreaks in animals as well as a number of infections in humans. "There have recently been some detections of avian influenza viruses in a small number of mammals in the UK