WASHINGTON, Sept. 18 (Xinhua) -- The U.S. Centers for Disease Control and Prevention (CDC) on Friday updated again on its website the guidelines for testing people who do not have symptoms of novel coronavirus.
"Due to the significance of asymptomatic and pre-symptomatic transmission, this guidance further reinforces the need to test asymptomatic persons, including close contacts of a person with documented SARS-CoV-2 infection," according to the website.
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