I didn't go there. Why did you call the public security bureau for epidemic prevention?

Investigate, if you get a call from the CDC, it may be that you have had close contact with a confirmed case or asymptomatic infected person recently.

Or you have had close contact with the case but you don't know it, which affects your health and safety and requires cooperation with the investigation.

Just returned from other places during the epidemic, the Public Security Bureau called to ask, which is the abbreviation of epidemic epidemiological investigation, which is conducive to epidemic control. This should be because the local epidemic prevention and control department found that you came back from other places according to big data and called you to find out if you had been to a medium-risk area. For this kind of call, it is recommended to actively cooperate with their investigation.