Now it takes 48 hours to go to Zhejiang to prove the nucleic acid test. The "health code" of mainlanders is green, but the travel card is marked with an asterisk, so self-declaration should be made according to the regional division of high-risk areas (referring to the management of high-risk areas).
The substance of nucleic acid detection is the nucleic acid of virus. Nucleic acid detection is to determine whether the patient is infected by COVID-19 by detecting whether there is nucleic acid of foreign invasive virus in respiratory tract samples, blood or feces. Therefore, once the nucleic acid is "positive", it can prove that there is a virus in the patient.