title: [Evaluation of the immunity to A/swine influenza virus in a sample of population of Rome].
abstract: Hemagglutination-inhibiting (HI) antibodies in respect of type A/swine influenza virus (strain NIB/3) were titrated on 225 serum specimens taken in Rome during 1976. No HI antibodies to the A/swine virus were found in the serum specimens of the 155 subjects under 50 years of age, while the majority (94%) of the serum specimens of the subjects over 70 years of age showed HI antibody reactivity to the virus, with a mean geometric titre of 21.75. The vaccination of 38 individuals over 50 years of age with live attenuated influenza virus (strain H3N2 - A/Port Chalmers/1/73) failed to cause any elevation of HI antibody titres against A/swine influenza virus, though producing significant seroconversion in respect of the A/Port Chalmers influenza virus in more than 60% of the vaccinees.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000914:Antibodies, Viral / Q000302:isolation & purification; D000917:Antibody Formation; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007109:Immunity; D007223:Infant; D009980:Influenza A virus / Q000276:immunology*; D007252:Influenza Vaccines; D008875:Middle Aged; D012384:Rome; D014505:Urban Population
chemical_list: D000914:Antibodies, Viral; D007252:Influenza Vaccines
vernacular_title: Valutazione dell'immunita' per il virus influenzale A/swine in un campione di popolazione di Roma