UN Warns of Worldwide Threat from Killer Pneumonia Sat March 15, 2003 11:21 AM ET By Richard Waddington GENEVA (Reuters) - The World Health Organization warned on Saturday of a worldwide health threat as a mystery killer pneumonia spread from east Asia to other parts of the globe. Releasing a rare "emergency travel advisory," the United Nations health agency said an ill passenger had been taken to an isolation unit in Frankfurt, Germany, on Saturday after being removed from a plane en route from New York to Singapore. Some 155 other passengers who had been due to change planes or...