The composition of the pharyngeal swab is cotton only, with no other special material. The sample collector used for nucleic acid testing, the pharyngeal swab, has no special ingredients and is just an ordinary cotton product. The sample is collected in the throat area through the swab and then stored in the anti-protein lysate of the test tube, which can provide valid samples for nucleic acid testing experiments. The fluorescent agent rumored on the Internet does not exist in the swabs, fluorescence test is the experimental method of nucleic acid testing, through the fluorescence of the search for the presence of the new coronavirus, in the process of collecting samples without the use of fluorescent agent, so the public can rest assured that the nucleic acid test, generally will not be due to the swabs to cause any adverse consequences.