Symptoms of fever may occur after the third injection of the new coronavirus vaccine, and individuals may have symptoms of high fever. At present, medical reports that a few people may have fever after the third injection of the new coronavirus vaccine. Fever is mostly an adverse reaction caused by the new coronavirus vaccine, and patients may be accompanied by fatigue, hardness and pain at the injection site. If the temperature does not exceed 38.5 ℃, generally do not need special treatment, you can use warm water to wipe the skin or drink more hot water, usually 2 ~ 3 days the temperature will return to normal. If the fever exceeds 38.5℃ or is accompanied by other clinical symptoms such as chills and vomiting, it is necessary to go to the hospital in a timely manner to find out the cause, and then you can take antipyretic drugs such as acetaminophen or ibuprofen under the guidance of the doctor. After receiving the new coronavirus vaccine, you need to pay attention to keep the injection site clean and dry, and do not take a shower on the same day to avoid infection. Vaccination is not 100% immune, so you should still do a good job of personal protection, wear a mask when you go out, and wash your hands often.