Adverse reactions to the New Crown booster injection include respiratory, digestive, skin, mental status, severe allergic reactions, etc. 1. Respiratory system: mainly including fever, but the degree is relatively mild, and most of the inoculants will be able to relieve themselves within 1 week. 2. Digestive system: common abdominal pain, diarrhea, nausea and vomiting, etc., usually can be relieved in 2~3 days. 3. Skin: localized redness, swelling, itching and pain at the site of inoculation, which can usually be relieved on its own. 4. Mental state: weakness, poor spirit, drowsiness and other manifestations can occur. 5. Serious allergic reactions: some of the vaccinees with a history of severe allergy may have serious allergic reactions such as respiratory failure, and such people are not recommended to be vaccinated. After vaccination, patients should pay attention to observe their own body changes, if the symptoms continue not to relieve, it is recommended to consult a doctor in time.