Is it better to pay out-of-pocket or get the enhanced polio vaccine for free for a 4-year-old child?

Patient's question:

Sure, here is the translation of the content you provided:
No

Doctor's answer:

Hello, there is no difference. Sabin vaccine (polio oral live vaccine) is given free of charge orally. The vaccination schedule is one dose each at 2, 3, and 4 months, and it is best to have a booster dose at 4 years of age.