When does the traffic information start?

1. epidemic control is not only aimed at people who are positive for nucleic acid testing, but also at his close contacts, even close contacts of close contacts. As long as there is the risk and possibility of transmission, they will try their best to check the trajectory and block the virus, all in order to find out the source of infection and block the transmission chain.

2. People who are positive for nucleic acid testing must first be the starting point and center of work. According to the different situation of this individual, two or even three layers of contact investigation should be done.