Doing nucleic acid currently refers to the new coronavirus nucleic acid test, do nucleic acid mouth touched by the doctor is generally a small risk of infection, you can promptly use a cotton swab dipped in alcohol to disinfect, while the follow-up timely nucleic acid test. Do nucleic acid mouth by the doctor touched the general will not cause the new coronary virus infection, although in the nucleic acid test, especially large-scale screening, the doctor can not do every time you do a sample to change a pair of gloves, but generally will take alcohol and other gloves disinfection, in most cases can be killed by the new coronary virus, there is no risk of transmission in general. However, if you are not sure you can use a cotton swab dipped in alcohol to disinfect the mouth in a timely manner, local disinfection of the mouth can be repeated 2~3 times. Meanwhile, nucleic acid testing should be performed continuously in the following 3~5 days, so that the infection can be detected as soon as possible and the risk of transmission can be reduced.