Health experts say a shortage of test kits means the United States may be underestimating the extent of the virus outbreak.
卫生专家说,缺少检测工具意味着美国可能低估了病毒暴发的规模。
A study this week indicated that the novel coronavirus was likely far more widespread than official figures suggest.
本周的一项研究表明,新冠病毒的传播范围很可能比美国官方数字显示的要广得多。
Blood samples taken from 3,300 volunteers in Santa Clara County showed the true number of COVID-19 cases was at least 50 times higher than the number of confirmed infections in the county, according to the study by Stanford researchers.
斯坦福大学开展的一项研究显示,从圣克拉拉县3300名志愿者身上采集的血液样本显示,该县新冠肺炎病例的实际数量至少比此前官方公布的数量高出50倍。
Santa Clara was among the first areas in the US to tell residents to stay at home to contain the spread of the virus, ordering a shutdown from March 17.
圣克拉拉县是美国首批要求居民居家隔离控制病毒传播的地区之一,并下令从3月17日起实行封锁。
The United States has recorded more than 800,000 confirmed cases of COVID-19 since the start of the pandemic, according to a tally from Johns Hopkins University, with over 45,000 deaths -- the most reported of any country.
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