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Until the end of 2002, when scores of people in China began falling ill with a mysterious respiratory infection, SARS-CoV was a completely unknown virus. It had almost certainly, however, been hiding in plain sight in the wild for hundreds–if not thousands–of years. But scientists had yet to identify or study it conclusively.
That all changed quickly when the SARS pandemic began that year. Within months, SARS had spread to nearly every continent. Before it was contained, 8,000 people had contracted SARS; more than 700 people died. All told, SARS is estimated to have cost between $30 and $50 billion to the global economy from 2002 to 2003.