High fever refers to a body temperature of 39.1~40℃. You can take antipyretic medication for high fever after taking the New Crown vaccine, but you should take it under the guidance of your doctor or pharmacist. Normal people will have adverse reactions such as redness, swelling and pain at the vaccination site as well as mild fever after receiving the New Crown vaccine. If you have a high fever after receiving the New Crown vaccine, you can take antipyretic medications such as ibuprofen and acetaminophen, which are able to lower the body temperature, for those whose body temperature is more than 38.5℃. For patients with recurrent high fever lasting more than 24 hours and accompanied by other symptoms, it is important to consider whether it is caused by factors other than the vaccine such as upper respiratory tract infection, pneumonia, etc. It is recommended to seek medical advice without delay. During the period of medication, you also need to pay more attention, you can drink more water, use warm towels to wipe the skin, to increase the area of skin heat dissipation. You can also put a cooling patch on your forehead, which can promote cooling.