Disease may change to an even deadlier formSars resembles the fatal flu virus of 1918 By Charles Arthur, Science Editor 06 April 2003 Reinhard Kurth, the head of the German government's Robert Koch Institute, was not exactly encouraging on Friday night. A vaccine for Sars could be developed, he said – but it would take three to five years. Experts worldwide are still struggling to identify precisely what is causing the illness, and how it is transmitted. Some can already see light at the end of the tunnel. "To me, the epidemic is almost certainly over," said Osman David Mansoor,...