Most people will not have any significant adverse reactions after the New Crown booster vaccination. Some people may experience pain, swelling, itching and other adverse reactions at the vaccination site. Some people may have adverse reactions such as diarrhea, nausea, and low-grade fever. Adverse reactions to the New Crown booster shot are generally the same as those from previous vaccinations. Some vaccinated persons may experience soreness, swelling, hardness and itching at the injection site. Occasionally, symptoms such as fever, headache, nausea, malaise, and muscle aches may occur. However, such symptoms usually resolve on their own within 2 to 3 days. A New Crown booster is a dose of vaccine that is administered after a full course of New Crown vaccination has been completed to maintain the body’s immunity to a specific antigen. The booster is similar to the previous vaccine in that it requires 30 minutes of observation, avoiding bathing for 24 hours, eating a light diet, and being aware of any adverse reactions. If you have a severe or prolonged adverse reaction to the new booster, you should go to a hospital for treatment.