Nucleic acid testing can usually be done 48 hours after the third vaccination. The reason for not doing nucleic acid test after vaccination is that the new coronavirus vaccine will make the human body produce antibodies after injection into the human body, and the nucleic acid test is very sensitive, so if you do the nucleic acid test again, the residual components of the vaccine will lead to false-positive results, therefore, do not enter the nucleic acid sampling area or sampling room within two days after the inactivated vaccine of the new coronavirus and do not do the nucleic acid test. The New Coronary Vaccine is mainly prepared from the New Coronary Virus through inactivation, culture and other processes, and when injected into the human body, it can cause the body to produce antibodies, thus reducing pathogenicity and infectivity. After receiving the new crown vaccine, it is necessary to pay attention to rest, avoid staying up late, do not do strenuous exercise, prohibit smoking, drinking alcohol, avoid spicy and irritating food. During the epidemic prevention and control period, remember to wear a mask when you go out and try to avoid crowded places, such as movie theaters, supermarkets, parks, etc., so as not to lead to the emergence of cross-infection. If you feel unwell after vaccination, you should go to the hospital in time to avoid delaying your condition.