Is Shanghai Grid Screening a Universal Screening?

The purpose of grid nucleic acid screening is to find the potential source of infection as soon as possible, effectively cut off the transmission route and realize the dynamic zero elimination of society as soon as possible. After the expert group's judgment, according to the regional risks and other conditions, some key areas in Shanghai were determined. Within two days and 48 hours, people in these key areas (except those already in the control area) were screened twice for nucleic acid. Whether it is a high-risk post with closed-loop management or a post already in the routine screening mechanism, the routine screening will continue according to the original mechanism.