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“Testing is the biggest problem that we’re facing,” Peter Slavin, president of Massachusetts General Hospital, said recently in a roundtable on Covid-19 at Harvard Medical School. While South Korea had tested about 4,000 people per million of its population at the time, the United States had just run five tests per million — despite the fact that they both reported their first cases at essentially the same time (on January 21 and 20). The discrepancy was surprising because the genome of the virus had been available since January and scientists had figured out the diagnostics shortly thereafter, using proven molecular methods first discovered in the 1970s.