RT: The CDC, changing its Covid-19 testing guidelines, no longer recommends testing for most people without symptoms, even if they've been in close contact with someone known to have the virus. Many doctors are puzzled by the agency's change. https://cnn.it/3lkwqUL
RT：CDC 更改了其 Covid-19 检测指南，不再建议对大多数没有症状的人进行检测，即使他们与已知感染该病毒的人有过密切接触。许多医生对该机构的变化感到困惑。 https://cnn.it/3lkwqUL