Persistence of poliovirus-neutralizing antibodies 2–16 years after immunization with live attenuated vaccine. A seroepidemiologic survey in the mainland of Venice.

1,155 subjects (197 children followed prospectively 7-11 years post-vaccination and 958 young males 16 years post-vaccination) from the mainland of Venice, Italy, who had received a full vaccination course with live attenuated poliovirus.

Full vaccination course with live attenuated poliovirus (OPV)

Proportion of subjects without detectable neutralizing antibodies (titre < 4) and median antibody titres against poliovirus strains 1, 2, and 3surrogate