What does the epidemic prevention short message sent by China Mobile mean?

This is the information sent by the Municipal Center for Disease Control and Prevention through big data screening.

Big data shows that you may have been exposed to cases or asymptomatic infections in COVID-19, or you may have been exposed to the environment or articles polluted by COVID-19.

After receiving the message, don't panic, please do this:

1, if you have ever lived in a middle-high risk area, especially overlapping with the activity track of people with positive nucleic acid test, please isolate at home first, report to the local community (village) or county-level CDC immediately, and cooperate with relevant epidemic control measures. 2. If you come from a city in a middle-high risk area, but you have never stayed in the middle-high risk area, and there is no overlap with the activity track of the people with positive nucleic acid test, please do the nucleic acid test as soon as possible under the condition of personal protection, and pay attention to personal protection and health monitoring in your daily life. City CDC will not require citizens to transfer money, remit money, provide bank card passwords and verify in any form.

The general public should be vigilant, don't trust calls and text messages of unknown origin, and don't click on links of unknown origin.