Nucleic acid testing can be done after a booster shot, but it should be noted that it is recommended that nucleic acid testing be done 48 hours after a booster shot of the new coronary vaccine. If the nucleic acid test is done immediately after the booster shot, the result is likely to be false positive. The booster shot is usually referred to as the New Crown Vaccine booster shot, and it is recommended that the nucleic acid test be done 48 hours after the booster shot. The PCR technique is extremely sensitive for the detection of neocoronavirus nucleic acid. Although the virus of the neocoronavirus vaccine has lost its infectivity and pathogenicity after inactivation in culture, it still retains a relatively intact nucleic acid fragment. False-positive results may occur if the nucleic acid fragments are sampled and tested prior to degradation. Therefore, it is recommended that nucleic acid testing be done after 48 hours. WARNING: Wear a mask when receiving the New Crown vaccine, try to avoid touching objects around the vaccination site, and wash your clothes promptly after returning home.