I have no close contact with Zhen Zhen. Why did Xi 'an Epidemic Prevention Station send me a message?

Does the subject want to ask, "I haven't had close contact with the confirmed patient, so why should I send a message to Xi 'an epidemic prevention station?" "... because it is the result of large-scale system analysis. The information obtained from Xi 'an epidemic prevention station is caused by large-scale system analysis. Although I didn't have close contact with the confirmed patient, I may have contacted the environment or articles polluted by COVID-19, so I received the information.