Mutations of the SARS virus and relapses among patients are worrying scientists trying to understand the disease, as the number of deaths in the past month increases five-fold. Doctors at the Chinese University of Hong Kong said two forms of SARS have hit the Chinese territory, which could complicate efforts to develop a diagnosis and vaccine. "This rapid evolution is like that of a murderer who is trying to change his fingertips or even his appearance to try to escape detection," Dr. Dennis Lo said. Lo added more research is needed to determine whether the virus has become more infectious or deadly. Also worrying scientists is at least a dozen cases of SARS relapses among discharged patients. Globally, more than 400 have died from SARS, and more than 6,000 people have been infected.

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