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Avidity of anti-recombinant P2 (rP2) antibodies induced by subcutaneous (SQ) vs. intranasal (IN) immunization. Avidity was tested by enzyme-linked immunosorbent assay (ELISA), using sodium thiocyanate (NaSCN) to disrupt antigen–antibody binding. Experiments were performed in triplicate. Results are expressed as the mean±s.e.m.
