Immune Persistence following Primary Immunization and the Immunogenicity and Safety of a Booster Dose of a Multidose Sabin Strain-Based Inactivated Polio Vaccine in Infants Aged 18 Months.

The GMTs for types 1, 2, and 3 were 642.57, 312.63, and 325.81 (GMI 0.23, 0.67, and 0.16) in the 5-dose test group; 193.05, 142.34, and 130.54 (GMI 0.35, 0.73, and 0.13) in the conventional IPV control group; and 701.65, 327.51, and 365.23 (GMI 0.23, 0.63, and 0.16) in the single-dose sIPV control group, showing a decreasing trend over time and being lower than those at 30 days after primary immunization.

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