1. The operator holds the swab by the right hand and holds the head of the subject fixedly by left hand. Putting the swab downing backwards the bottom of the nasal cavity and penetrate slowly and gently. Do not overexert to avoid traumatic hemorrhage. 2. When the cusp of the swab touching the paries posterior of the pharyngonasal cavity, letting the swab remain in the place for a few seconds (about 3 seconds) and rotating the swab gently for one cycle, and then remove the swab slowly.
2) Collection method of oropharyngeal swab:
1. The head of the person to be collected is slightly titled and his mouth is wide open, exposing the pharyngeal tonsils on the both sides. 2. Wipe the swab across the root of the tongue. Wipe the pharyngeal tonsils on both sides of the person to be collected back and forth with a little force for at least 3 times, and then wipe up and down the posterior pharyngeal wall for at least 3 times.
Add 500 μL（~20 drops）of sample extract to the 0.5 mark of the sampling tube, dip the swab after collecting the sample into the sample extract, make the sample extract fully permeate the swab, rotate and squeeze the swab 10 times. then pull out the swab, and take the stranded liquid as the sample to be tested.