Persistence of poliovirus-neutralizing antibodies 2―16 years after immunization with live attenuated vaccine. A seroepidemiologic survey in the mainland of Venice
1988
A seroepidemiological survey was conducted on subjects who had received a full vaccination course with live attenuated poliovirus 2-16 years before. For strains 1 and 2 prevalence of seropositives and median values dropped gradually during the first 10 years; strain 3 showed a much earlier decline. Environmental displacement of wild poliovirus by the attenuated, less immunogenic strain might eventually induce a 'gap', should complacency hamper needed vaccination efforts.
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