Pharyngeal swab is a small amount of secretion dipped from the pharynx of the person to be tested with a sterilized medical swab, and then the virus is tested in the respiratory tract. The test method is to ask the patient to open the mouth to make “ah” sound, fully expose the pharynx, and then use the long swab to wipe both sides of the pharyngeal and palatal arches and tonsils on the secretions, after collection, quickly put the swab into the test tube with the test, and sealed in time to send the test. It is best not to use drugs before the test to avoid affecting the test results. The patient may experience pharyngeal discomfort during the test, which is mostly tolerated. Clinically, the throat swab can detect respiratory syncytial virus, as well as influenza A and B viruses and novel coronavirus. The method is simple, convenient, fast and provides rapid results to guide clinical diagnosis and treatment.