The solution used to preserve the sample for nucleic acid testing does not normally come into contact with the human body and is generally harmless. The main component of the solution used to preserve samples for nucleic acid testing is guanidinic acid. It is strongly alkaline and is not harmful to the body after a small amount comes into contact with the skin, while a large amount of contact may cause skin allergies. However, the amount of water in the nucleic acid test tube is very small, even if it is accidentally poured out and comes into contact with the skin, as long as it is rinsed with water in a timely manner, it will not be harmful to the human body. In the usual nucleic acid test process, generally through the cotton swab directly in contact with the mucous membrane of the skin, and then put the cotton swab into the medicine to save, the medicine is generally not in contact with the human body, and there is no possibility of airborne transmission, this time, the nucleic acid test of the medicine more will not cause harm to the human body. The process of nucleic acid testing, unless the person being tested does not cooperate or the tester is not operating properly, may cause slight mucosal damage in the sampling process. Regarding whether the nucleic acid test solution is harmful to the human body, there is no need to worry too much, and it is recommended that we do a good job of personal protection and actively cooperate with the epidemic prevention work.