The third injection is generally the third injection of the new crown vaccine, and after the third injection of the new crown vaccine, we should pay attention to observe whether there are any adverse reactions. If there are no contraindications to the vaccination of the new crown vaccine, it is recommended to receive the new crown vaccine for the whole course of the vaccine, and generally speaking, there is no particularly obvious adverse reaction after the third vaccination of the new crown vaccine. However, the occurrence of adverse reactions is also individualized. Individual patients may have allergic reactions, such as itching, rash, local hard nodules, diarrhea, fever and other discomforts after receiving the third dose of New Crown vaccine. A very small number of patients may experience anaphylactic shock after the third dose of New Crown Vaccine, which may require emergency rescue. Therefore, after receiving the third dose of New Crown Vaccine, you should observe the vaccination site for 30 minutes and leave only if there is no special discomfort. After returning to the vaccination site, you should observe whether there are any adverse reactions to the vaccine, and if there are, you should consult a doctor as soon as possible. It is recommended to seek medical attention as soon as possible if you have any special discomfort after the third vaccination.