Fewer than 10 per cent of Americans have antibodies that could protect them from developing Covid-19, according to the first nationally representative survey that shows the vast majority still have not developed an immune response to the virus.
第一项具有全国代表性的调查显示，只有不到10%的美国人具有可以保护他们不被新型冠状病毒肺炎（COVID-19，即2019冠状病毒病）感染的抗体，表明绝大多数人仍未对新冠病毒产生免疫反应。
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