Nucleic acid test can be done once a day, which can improve the detection rate and has no effect on your health. The genetic material of viruses is nucleic acid, including DNA and RNA. Nucleic acid test is to detect the DNA or RNA of a specific virus to determine whether the human body is infected with the relevant virus. The new coronavirus, for example, is an RNA virus that mainly infects the human respiratory tract. Nucleic acid testing can be done by collecting respiratory specimens, blood, feces, etc., from the subject for laboratory testing, and a positive test means infection with the relevant virus. Single sampling may not be accurate due to irregular operation, patients in incubation period, insufficient viral load in the body, etc. Generally, multiple sampling is required to improve the accuracy. Sampling is less damaging to the human body and has no effect on health. Nucleic acid can be done once a day, and if the test is negative for several times, the testing interval can be increased, and if there is any discomfort, consult a doctor promptly.