Reuters reports that SARS fine-tuned itself to become more infectious.
"What we see is the virus fine-tuning itself to enhance its access to a new host -- humans," Chung-I Wu, a professor and chairman of ecology and evolution at the University of Chicago, said in a statement.
"This is a disturbing process to watch, as the virus improves itself under selective pressure, learning to spread from person to person, then sticking with the version that is most effective."
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