Diphtheria, tetanus and poliovirus antibody persistence 5 years after vaccination of pre-schoolers with two different diphtheria, tetanus and inactivated poliomyelitis vaccines (Td-IPV or DT-IPV) and immune responses to a booster dose of DTaP-IPV

The present study confirmed the long-term immunity conferred by Td-IPV when given as a booster dose, and supports the use of Td-IPV as a second booster at 6 years of age in children previously vaccinated against diphtheria, tetanus and poliomyelitis types 1-3.