Trevor Bedford, a researcher at Seattle’s Fred Hutchinson Cancer Research Center, discusses how  genome sequencing is being used to track the spread of the COVID-19 coronavirus at the American Association for the Advancement of Science’s annual meeting. (Fred Hutch News Service Photo / Natalie Myers) An evolutionary analysis based on the genome sequences of coronavirus samples taken from patients in the Seattle area suggests that the number of infections doubles roughly every six days, which translates into hundreds of infections over the course of the past six weeks.

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