Do I need to do nucleic acid to buy medicine and send text messages?

Because I bought cold medicine at the drugstore, I was informed by the street office to do nucleic acid testing every few days. Everyone thought that such testing should not be charged. Because during the epidemic period, nucleic acid testing in risk areas will be done more frequently, so it should be done in large quantities and there should be no charge.

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.

Principle of nucleic acid detection:

All living things contain nucleic acids, including DNA and RNA. Novel coronavirus is a virus containing only RNA, and the specific RNA sequence in the virus is a sign to distinguish the virus from other pathogens. After novel coronavirus appeared.

Scientists in China completed the whole genome sequence analysis of novel coronavirus in a short time, and found the specific nucleic acid sequence in novel coronavirus by comparing it with the genome sequences of other species. If novel coronavirus's specific nucleic acid sequence can be detected in patients' samples during clinical laboratory testing, it should be suggested that patients may be infected by novel coronavirus.