Because of the epidemic situation, nucleic acid certificate is required to enter any public place in China. For the sake of epidemic prevention and control in China, the cinema staff can understand.
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.