Incubation period nucleic acid testing is detectable in most cases. In the case of Newcastle pneumonia, for example, incubation period nucleic acid testing is detectable in most cases, but there are a few cases where it is not detectable. The incubation period of NCCV is usually 1-14 days, when patients usually have atypical or no obvious symptoms, i.e., no cough, fever, etc. If a nucleic acid test is performed and a positive result is detected, the patient is considered to be asymptomatic for New Coronavirus pneumonia. However, some people who have been infected with New Coronavirus and are in the incubation period may not be able to detect the virus in nasal or pharyngeal secretions because their body viral load has not yet reached a certain number, or may be affected by the collection site and sensitivity of the reagents, resulting in false negative test results. To avoid false negatives, it is usually recommended that suspected patients be tested multiple times during this period. In particular, high-risk groups at risk of infection, such as those with a history of exposure to the new coronavirus or a history of travel to high-risk areas, should be placed under quarantine observation as required, and the quarantine observation should not end until after several consecutive negative nucleic acid tests during the observation period. In addition, if symptoms such as fever, runny nose, malaise, sore throat, cough, etc. still occur after the observation period, you should also seek medical attention at the fever clinic and have your nucleic acid status checked again to avoid being infected with a mutated strain of the new coronavirus, which may cause an extended incubation period.