Abstract
The antibody response (determined using the single radial haemolysis in gel technique) to inactivated whole-virion trivalent influenza vaccine [A/Leningrad/360/86(H3N2), A/Taiwan/5/87 and B/Ann Arbor/1/86], recommended for the 1987–88 winter season in Italy, in 49 elderly (age ⩾ 60 years) subjects was compared with the response in 23 young adult (age < 60 years) volunteers. The subjects were prevalently healthy and a high percentage of young and old people had been repeatedly immunized against influenza in previous years. No significant differences were detected among age groups; moreover, the immune response measured by seroconversion or by a significant rise in antibody titre was constantly low.
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