Big data text messages are messages sent by the CDC through big data screening. Big data indicates that you may have had contact with a case of neocoronavirus pneumonia or an asymptomatic infected person, or may have been exposed to an environment or object contaminated with neocoronavirus.

Don't be alarmed when you receive the text message, please do the following:

1. If you have been stationed in a medium- to high-risk area, especially if you overlap with the activity track of a person who has tested positive for nucleic acid, please quarantine yourself at home first, report immediately to your local community (village) or county CDC, and cooperate with relevant outbreak control measures.

2. If you come to Changsha from a city with a medium-high risk area, but have not stayed in the medium-high risk area, and there is no overlap with the activity track of the nucleic acid test-positive people, please take the nucleic acid test as soon as possible in the nearest place under the circumstance of good personal protection (see Changsha's release and Changsha's official microblogging of CDC for details of the sampling points of Changsha's nucleic acid test for the new coronavirus in Changsha City), and pay attention to good personal protection and health monitoring in your daily life.