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Geometric mean titres of poliovirus type-specific serum neutralising antibodies in each group at each sampling timepoint
Error bars are 95% CIs. f-IPV was one-fifth of a normal IPV dose. IPV was administered intramuscularly. f-IPV was administered intradermally. IPV=inactived poliovirus vaccine. f-IPV=fractional-inactived poliovirus vaccine.
