Nucleic acid testing can be done after vaccination, but the results may not be accurate and there is a possibility of false positives, so try not to do it immediately, and it is recommended to do it at an interval of 48 hours after vaccination. In special cases where the test must be done immediately, it is important to be aware of the possibility of false positives. Nucleic acid testing should not be done immediately after vaccination, as this may lead to a positive result. Most of the vaccinated patients received the inactivated vaccine of the new coronavirus. Although the coronavirus strain is not contagious, the inactivated vaccine still contains nucleic acid sequences of the new coronavirus, which may lead to a positive nucleic acid test result. In addition, it is recommended that the nucleic acid test be performed 48 hours after leaving the vaccination site because the suction and venting of the vaccine at the site of the new coronavirus vaccination may result in contamination of the vaccination site and the surrounding population.