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时间:2021-02-28

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最新鼎新August 17A week into the fall semester, the University of North Carolina at Chapel Hill announces all undergraduate classes will move online because of high infection rates on campus最新鼎新The first doses could be delivered within days of the announcement最新鼎新Emergency use authorization and even full approval of the vaccines is probably not far off in the United States and other countries最新鼎新But another race is just beginning。最新鼎新。最新鼎新Ultimately, the vaccines won’t truly be successful until enough people have gotten them to stop the spread of the virus and prevent severe disease and death最新鼎新And that will pose a logistical challenge unlike any other最新鼎新In normal times, potential vaccines have only a 10 percent chance of making it from Phase II clinical trials — which test safety, dosing and sometimes give hints about effectiveness — to approval within 10 years, researchers reported November 24 in the Annals of Internal Medicine

最新鼎新But another race is just beginning。最新鼎新。最新鼎新Ultimately, the vaccines won’t truly be successful until enough people have gotten them to stop the spread of the virus and prevent severe disease and death

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