We studied the immunogenicity of an acellular pertussis vaccine composed of genetically detoxified pertussis toxin (PT-9K/129G), filamentous haemagglutinin, and a 69-kilodalton protein, pertactin, in 30 children aged 12 to 24 months and in 80 infants aged 2 to 4 months. A significant increase of the neutralizing titer and of the titers against pertussis toxin, filamentous hemagglutinin, and pertactin, as determined by enzyme-linked immunosorbent assay, was achieved after three doses of vaccine in all the children; a significant increase of these antibody titers was obtained in 100%, 96.1%, 93.5%, and 98.7% of the infants, respectively.

Immunogenicity of an acellular pertussis vaccine composed of genetically inactivated pertussis toxin combined with FHA and pertactin in infants and children / Podda, A.; CARAPELLA DE LUCA, E.; Titone, L.; Casadei, A. M.; Cascio, A.; Bartalini, M.; Volpini, G.; Peppoloni, Samuele; Marsili, I.; Nencioni, L. AND RAPPUOLI R.. - In: THE JOURNAL OF PEDIATRICS. - ISSN 0022-3476. - STAMPA. - 123 (19)(1993), pp. 81-84.

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