Bird flu shows signs of mutation: China expert (Environmental News Network) HONG KONG (Reuters) - A Chinese expert on respiratory diseases says the H5N1 bird flu virus has shown signs of mutation and urged vigilance at a time when seasonal human influenza is at a peak, newspapers reported on Tuesday. "When avian flu is around and human flu appears, this will raise the chances of avian flu turning into a human flu. We have to be very alert and careful in March," Zhong ... [News Source]