The way to open the mouth for pharyngeal swab collection is to fully expose the pharynx and throat, exposing the palate. The specific operation is as follows: open the mouth wide, in order to control the neck on both sides of the veins up, the tongue as much as possible to relax, do not spit out the tongue, inhale through the mouth can make the palate upward contraction, open the mouth before the completion of the exhalation, open the mouth after the beginning of the inhalation. Opening the mouth and making an “ah” sound will also raise the palate. Pharyngeal swab collection refers to the use of a long, sterilized medical swab, dipped in a small amount of secretion from the pharynx of the person to be tested, sampling the posterior wall of the pharynx and the crypts and sidewalls of the tonsils, and then repeatedly swabbing the area for 3-5 times to collect the mucosal cells. Pharyngeal swabs were collected in a sitting or semi-sitting position, with the subject’s head slightly tilted, mouth open wide, and head resting against a wall or against the back of a chair. Pharyngeal swabs should be collected according to the instructions of the healthcare provider.