text_1: With polio vaccine, do they need a total of 4 as long as one is after 4 years of age?  Or let's see, how did it go?  She got 4 inactivated polio vaccines but the question was, is it that you need a total of 4 or does 1 have to be after 4 years old?
text_2: Does one of the four childhood polio vaccine doses need to be after 4 years of age?