Why the Chinese government frequently requires nucleic acid testing

The Chinese government frequently requires nucleic acid testing (NAT) to detect the presence of the COVID-19 virus. This is done to identify and isolate infected individuals, in order to prevent the spread of the virus. NAT involves collecting a sample from the nose or throat and analyzing it for genetic material specific to the virus. This test is considered to be highly accurate and is a key tool in controlling the spread of the virus. The Chinese government has implemented strict measures to control the spread of COVID-19, including requiring NAT for people entering the country or traveling to certain regions, as well as for individuals exhibiting symptoms or who have been in close contact with an infected person.