Fever usually lasts 1~2 days after polio vaccination, you can use physical cooling, follow the doctor’s instructions to use acetaminophen and other drugs to reduce fever, if necessary, timely medical treatment. Polio vaccine injection is inactivated polio vaccine, routine vaccination procedures for 2-3-4 months for 3 doses of basic immunization, 18 months of age for 1 dose of booster immunization, according to the instructions for use of the drug, common adverse reactions include redness, swelling, pain at the injection site, moderate, transient fever, rare swelling, lymph node enlargement, allergic reactions, myalgia, skin rash, and so on. According to the drug instructions and clinical observation, after injection of inactivated polio vaccine, the fever is usually moderate and transient, lasting for 1~2 days and can be gradually relieved. Parents can reduce the baby’s clothing, increase water intake, and lower the indoor temperature appropriately. If the baby is older than 3 months of age, acetaminophen can be used to reduce fever as prescribed by the doctor. If the temperature does not go down or the baby is younger than 3 months of age, it is recommended that the baby seeks medical treatment promptly. Parents are advised to closely observe the baby’s spirit, sleep and diet when the child has a fever, and to seek medical attention if the baby is unable to handle the fever on its own. Drugs need to be used under the guidance of a medical professional, and should not be used arbitrarily.