A few days ago, throat swabs, anal swabs and serum tests were carried out in Daxing District of Beijing. Experts said that the study found that the duration of nucleic acid positive in feces or anal swabs of some infected people is longer than that of upper respiratory tract. Increasing anal swab sampling can improve the detection rate and reduce missed diagnosis; however, anal swab sampling is not convenient enough and is only used for key groups such as isolation points.
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