There may be an incubation period after a negative nucleic acid test, indicating a false negative. The incubation period is usually 1 to 14 days, mostly 3 to 7 days, and retesting is required. Nucleic acid testing is primarily used to diagnose infection by the novel coronavirus. A positive result indicates a possible infection with this virus, while a negative result indicates a possible absence of infection. Often, a negative nucleic acid test may be followed by a latent period, which is a false negative, mainly because the novel coronavirus has not yet reached a detectable level of virulence in the early stages of invasion, or because the sample may be invalid due to improper storage. Clinical studies have shown that the incubation period of the new coronavirus is generally 1 to 14 days, but in most cases it is 3 to 7 days. Therefore, it is necessary to carry out nucleic acid tests several times during this period, and if they are all negative, the possibility of infection with the new coronavirus can be ruled out, and there is no need to worry too much, so continue to take good personal protective measures. In addition to the results of nucleic acid test, if you want to confirm whether you are infected with the new coronavirus, you need to combine with clinical symptoms, imaging tests, and a comprehensive analysis by a professional doctor. Once diagnosed, the patient needs to actively cooperate with the doctor for treatment and isolation.