Americans wondering when their lives will return to something resembling normal after the coronavirus outbreak may be hunkering down for a while.   Epidemiologists at Imperial College London published a new report last week on the potential number of deaths in the U.S. from COVID-19 and the measures necessary to prevent them. The report indicates nationwide restrictions—including social distancing, home isolation, and school closures—would need to be maintained, at least intermittently, until the virus subsides or a working vaccine is developed. Scientists tell 60 Minutes it will likely be more than a year before a vaccine to prevent COVID-19 is rolled out to the public. And there is no way to speed up the process. THE TIMELINE TO A VACCINEScientists around the world launched an urgent quest to develop a vaccine against the novel coronavirus on January 10, the day scientists in China posted the genetic sequence of the virus online. At Inovio Pharmaceuticals in San Diego, publication of the virus’s genetic blueprint was like the starting gun. Company scientists plugged the viral sequence into their computer algorithm, which spit out a fully designed vaccine on paper in just three hours.How remarkable is that turnaround? Kate Broderick, Inovio’s senior vice president of research and

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