Figure 7.

Sketch-map of Bluetooth wireless technology virus-tracking mechanism. (Note: Step 1: effective contact distance for collecting close contacts’ information; Step 2: When close contact conditions are reached, the mobile device starts recording information; Step 3: Someone get a positive PCR test result for COVID-19 (coronavirus) and confirmed cases were screened; Step 4: Through the cloud data, the records of the confirmer’s equipment are retrieved to obtain the people who have had close contact behaviors; Step 5: The background system will automatically pair through the key of the confirmed patient, and obtain the bluetooth signal key of all the user’s mobile phones that they have been in close contact with within a period of time; Step 6: Once a confirmed case appears, the mobile phone that has been in close contact with the patient’s mobile phone will also automatically warn its owner, reminding its owner that the person you have been in contact with has been diagnosed and needs self-quarantine and seek medical treatment as soon as possible.)