Long-Term Immunity Following Vaccination with Killed Poliovirus Vaccine in Sweden, a Country with No Circulating Poliovirus

摘要: The long-term immunity following vaccination with killed poliovirus vaccine was analyzed by making repeated antibody surveys. A comparison between the levels of vaccinated groups children and young adults in 1968 1978 indicated that mean age that, during period 1968-1978, had not received any extra booster differed <0.3 log1o. Children born 1964-1967 1960-1963 were compared 1978. two their last an average six 10 years ago, respectively. level older group, which "11 previously, 0.2 log1o lower against type 1 0.1 3 virus than corresponding titers younger who approximately earlier. to 2 identical both groups.