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Serum anti-TT IgG titers (mean ± SE). Rabbits (n = 4) were nasally immunized with 40 Lf TT and 20 μg QS with or without CDM, at weeks 0 and 2 and were bled at week 3. Sera anti-TT IgG titers (end-point titration) were determined by an ELISA method
