Why did Shenyang cancel the full-time nucleic acid bus and check the health code?

The reason why Shenyang should check the health code for all employees after canceling the nucleic acid bus is because the health code is bright, which is used to show the different risk levels of the code holders, so that managers can classify different risk groups and take corresponding management measures. Scan code is a scanned password, which can not only prove the risk level by scanning code, but also record that the scanner has been to the site. When a suspected case of COVID-19 is found in this area, relevant departments can directly identify other people in the same place at the same time according to background records, which is conducive to finding key people such as close contacts and sub-close contacts at the first time and implementing various control measures.