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Abstract
Highlights
* Mismatch between vaccine and circulating strains impairs vaccine immunogenicity. * Intradermal route (ID) of administration has been shown to enhance immunogenicity. * Intanza®15μg is the first licensed ID inactivated split-virion influenza vaccine. * We evaluated its ability to elicit antibody response against H3N2 circulating viruses. * Intanza®15μg elicited broader antibody responses than IM vaccine in the elderly.