Antigen testing generally refers to neocoronavirus nucleic acid testing, which can be performed using either nasal or throat swabs. Currently, there are several types of antigenic test kits for neocollins, including nasal and throat swabs, as well as serum antibody tests. Therefore, there are some differences in the sampling methods of different test kits. For nasal and throat swabs, the sampling steps are similar. For nasal swabs, the examiner first blows the nose with toilet paper, then tilts the head slightly and enters one nostril with the end of the swab in one hand, and then slowly penetrates 1-1.5 cm backward along the bottom of the inferior nasal passage and rotates the nasal cavity at least 4 times, and then repeats for the other nasal cavity. Pharyngeal swabs need to be applied deeper into the mouth in the same manner as nasal swabs to ensure that as much sample as possible is taken and to avoid random scraping and under-sampling to jeopardize the accuracy of the results. After sampling the nasal and pharyngeal swabs, the specimen should be put into the eluent and extract in the kit in order, and then the extract should be dripped into the sample holes and left for about 20 minutes for judgment. A positive antigen test is not sufficient to determine neocoronavirus infection, and a combination of nucleic acid testing, laboratory, and imaging tests are required to confirm the diagnosis.