One light-colored bar on the New Crown Antigen test indicates a weak positive test result. A weak positive result indicates that the patient may have been recently infected with the new coronavirus. A weak positive result may be due to the incubation period, when the viral load is insufficient, although false positives cannot be ruled out. False positives can be caused by errors in antigen testing. Therefore, usually when a new crown antigen test is weakly positive, the tester will review the test. Usually respiratory secretions are taken for testing, such as those from the pharynx, nasal passages, and possibly stool or even blood, to ensure the accuracy of the test results. After the diagnosis of C.pneumonia, isolation and protective measures should be taken in a timely manner, and targeted treatment should be carried out in cooperation with the doctor. Tip: In this article, the terms “neocoronavirus pneumonia” and “new coronavirus pneumonia” were renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.