Polio vaccine is the abbreviation for polio vaccine, which is used to prevent poliomyelitis. Polio vaccine is safe, but some children can have adverse reactions such as fever, redness and swelling at the injection site after receiving this vaccine. Usually, the above reactions can disappear naturally after a few days of vaccination and will not cause irreversible damage. Common clinical adverse reactions include the following: 1. Injection of inactivated polio vaccine: pain, erythema, sclerosis, transient fever and other adverse reactions in the injection area are common. A few people may have swollen lymph nodes, excitement, drowsiness or convulsions after vaccination, which can generally subside within 3 days. A small number of people may also have allergic reactions to the vaccine, such as rash or even shock. 2. Live oral attenuated polio vaccine: Most people have no adverse reactions, and a small number of people may have mild fever, nausea, vomiting, diarrhea and rash, which usually do not require special treatment. Very few people have severe adverse reactions, which can cause polio vaccine-related cases, such as fever and acute flaccid paralysis, etc. If necessary, it is recommended to seek medical attention for symptomatic treatment.