To determine antibody responses elicited by DTPa-6 (Infanrix Hexa; GlaxoSmithKline, Brentford, UK), we performed enzyme-linked immunosorbent assays, as previously described [40 (link)]. In brief, tetanus toxoid (TT), Bordetella pertussis toxoid (PT), Bordetella pertussis pertactic (PRN), and filamentous hemagglutinin (FHA) were coated to plates and overlaid with serially diluted mouse serum, and bound antibodies were detected using a mouse IgG-specific detection antibody, the binding of which was quantified by means of an electrochemiluminescent label.
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