The polio vaccine, also known as the polio vaccine, is given as a shot for the fourth time if the first three shots were inactivated, or as a sugar pill for the fourth time if the first three shots were oral attenuated vaccine. The attenuated polio vaccine is an oral live vaccine that is administered throughout the course of the vaccination, which requires four doses, at 2 months, 3 months, 4 months and 4 years of age, and the fourth dose, which is at 4 years of age, can be augmented by an oral vaccine, that is, by taking a sugar pill. The inactivated polio vaccine is an injectable form and is administered at 2 months, 3 months, 4 months and 1.5 years of age, with the fourth vaccination, also at 1.5 years of age, being the fourth dose. Polio vaccination is mainly for the prevention of poliomyelitis, you should take your child to the hospital in time according to the appointment time for vaccination, and after vaccination, you should stay in the place where the vaccination is given for half an hour before leaving, so as not to cause other adverse reactions. For vaccination, you should go to a local formal medical institution for further consultation and vaccination.