Antigenic testing generally refers to neocoronavirus antigen testing, which is more accurate with two bars, but there is a possibility of false positives and nucleic acid testing is still required. During the prevention and control of the new crown pneumonia outbreak, antigen detection generally refers to the new crown virus antigen test. Antigen self-testing refers to a neocoronavirus test done by collecting one’s own nasal swab with an antigen detection kit. The antigen test shows a red or purple band at both the “C” and “T” marks, and a darker or lighter band at the “T” mark, which is considered a positive result. If the antigen test appears positive, this situation represents the possibility of viral infection, regardless of whether there are respiratory, fever and other symptoms, should be transferred to the hospital, along with their use of sampling swabs, sampling tubes, test cards, etc. into a sealed bag for uniform treatment, avoid contact with other people, and good protection. Because antigen test is not as sensitive as nucleic acid test, there may be false positives, and can not replace the nucleic acid test, can not be used to confirm the diagnosis of new coronavirus infections, so the need for nucleic acid retest. Tip: In this article, “new coronavirus pneumonia” and “new coronavirus pneumonia” were renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.