H7N9 influenza mutating quickly

China reported 96 human infections and 47 deaths linked to H7N9 avian influenza last month, and scientists at Hong Kong University say the virus readily mutates and has rapidly developed into a form that kills chickens quickly, posing a threat to the poultry industry. "I think this virus poses the greatest threat to humanity than any other in the past 100 years," said Guan Yi, one of the world's leading virologists.