One of the mixed tests is positive, and other personnel need to carry out single separation and single sample nucleic acid testing. If one of them is positive during the mixed test, then this group of people who are conducting nucleic acid testing together belong to secret contact personnel.
Shaanxi One Code Communication is a new system upgraded by Shaanxi Health Code and xi 'an One Code Communication, which is convenient for residents in the whole province to use and meet the needs of epidemic prevention and control.