In order to maintain the consistency of policies and detect the epidemic risk as soon as possible, Shanghai, Shenyang and other places have recently relaxed the frequency requirements of nucleic acid testing after risk assessment, and the effective duration of negative nucleic acid testing certification has been extended from 48 hours to 72 hours On the one hand, the average incubation period of Omicron mutant is about 3 days, and the potential infected person can be found by nucleic acid detection within 72 hours;
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On the other hand, it is also to reduce the frequency of nucleic acid detection of residents, minimize the burden of epidemic prevention and control measures on residents, and minimize the impact on the normal production and living order.