en-us	The CDC has started administering antibody tests to gauge true scale of coronavirus spread
zh-cn	疾病预防控制中心已开始进行抗体测试，以衡量冠状病毒传播的真实规模

en-us	The Centers for Disease Control and Prevention confirmed Saturday it has begun conducting antibody tests
zh-cn	美国疾病控制和预防中心周六证实，已经开始进行抗体测试，

en-us	to determine the true number of people infected with the novel COVID-19 coronavirus, including those who never developed symptoms.
zh-cn	以确定感染新型COVID-19冠状病毒的真实人数，其中包括那些从未出现症状的人。

en-us	Unlike normal diagnostic tests, the antibody test can detect if a person has recovered from an earlier infection.
zh-cn	与正常的诊断测试不同，抗体测试可以检测一个人是否已经从早期的感染中康复。

en-us	If so, there's a chance they've built up some protection,
zh-cn	如果是这样的话，他们有可能已经建立了一些保护措施，

en-us	which could help inform future responses to the virus and perhaps even allow some people to re-enter the workforce.
zh-cn	这可能有助于为未来对病毒的反应提供信息，甚至可能允许一些人重新进入劳动力大军。

en-us	However, it's not yet confirmed if antibodies ensure immunity,
zh-cn	然而，抗体是否能确保免疫力还没有得到证实，

en-us	and there are still questions about the accuracy of such tests, especially those administered at home.
zh-cn	这种测试的准确性仍然存在疑问，特别是那些在家里进行的测试。

en-us	The CDC is planning three different studies related to the tests.
zh-cn	疾控中心正在计划与这些测试相关的三项不同的研究。

en-us	One, which is already underway, will look at blood samples from people who were never diagnosed with COVID-19 but live in hot spots.
zh-cn	其中一项已经在进行中，将研究从未被诊断出患有COVID-19但生活在热点地区的人的血液样本。

en-us	The agency will also conduct a national survey using samples from different parts of the country.
zh-cn	该机构还将利用该国不同地区的样本进行全国调查。

en-us	The hope is the survey will launch in the summer.
zh-cn	人们希望这项调查能在夏季启动。

en-us	The third study, for which there's no timetable yet, will consider special populations, like health care workers.
zh-cn	第三项研究目前还没有时间表，它将考虑特殊人群，比如卫生保健工作者。