专家警告，COVID-19检测阳性率高表明美国尚未准备好放松限制；还要注意非洲疾病“无声”传播的迹象
Experts Warn High Rates of Positive COVID-19 Tests Show U.S. Not Ready to Relax Restrictions; Also Note Signs in Africa of “Silent” Spread of Disease
【关键词】 COVID-19 ; Epidemiology ;
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