[Immune status of a school-population sample 5 years after antirubella vaccination].

Hemagglutination inhibition (HI) test for rubella immunity were performed on sera collected from 830 subjects five years after rubella vaccination. 629 sera were belonging to vaccinated school- girls and 201 to school-boys and girls not submitted to vaccination. The incidence of seronegativity was significantly lower (1%) in vaccinated girls compared to untreated (12%). The data presented indicate that rubella vaccination affords a persistent antibody protection even thought the antibody titre is low.