Ninth person dies of mystery disease as WHO warns world heath threat spread by air travel By MARGIE MASON HANOI, Vietnam (AP): A ninth person has died of a mystery form of pneumonia that the World Health Organization says cannot be stopped by standard drugs and is being spread across the globe by international air travelers. In a rare emergency warning, Geneva-based WHO described the fast-acting, highly contagious disease as "a worldwide health threat.'' It first struck China's southern Guangdong province in January when five people died. In recent days about 150 infections had been reported in Asia, Europe and...