Why does the health code spread yin but not yang?

The health password changed from yin to yang, and the positive person has been diagnosed. When the nucleic acid test is negative and the health code turns red, it is generally a system error. Go to a high-risk area. The patient's nucleic acid test result is negative, indicating that there is no infection. When the health code turns red, sometimes the system will go wrong. You can contact the health department by calling the hotline. If you go to high-risk areas or have contact with confirmed patients, the health code will turn red. It is suggested to contact the hospital and take the initiative to ask for isolation measures.