Polio vaccine is polio vaccine, at present, China’s polio vaccine is injected from the first dose of inactivated polio vaccine when the baby is two months old, and then injected a dose of inactivated polio vaccine at one-month intervals, and oral live attenuated polio vaccine at 4 months old, and then orally at 4 years old again. Oral polio vaccine is a national class I vaccine and is free of charge. Oral polio vaccine is usually given as one dose at four months of age and a booster dose at four years of age. Oral polio vaccine can make babies develop antibodies, which can effectively avoid and prevent the occurrence of polio in babies. There are Class I and Class II vaccines. Class I vaccines belong to the national immunization and are free of charge, while polio vaccine belongs to Class I vaccines. If there is any adverse reaction after polio vaccination, you need to go to the hospital for treatment.