The bird flu virus is only two mutations away from a form that can spread easily between people, sparking a pandemic in which millions could die, the UN bird flu chief said in an interview published in Portugal. "Only two mutations are needed for it to become easily transmissible among humans," Dr David Nabarro, who heads the UN drive to contain the virus, told weekly newspaper Expresso. "I wake up every morning thinking that today could be the day that I will see a report about a strange case of bird flu among humans," he said. The H5N1 bird flu...