1. If someone in your community is infected, the color of the health code may turn yellow or red.
2. If you have ever been to a high-risk area, the health code will automatically turn yellow or red.
3. If you take public transportation and someone in the same car is suspected or diagnosed with infection, then as a close contact, your health code will also turn yellow or red.
I recently went to a fever clinic for COVID-19 test.