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Anti-BBD IgA levels in (A) nasal wash; (B) saliva; (C) serum and (D) anti-BBD IgG levels in serum (data are means ± standard deviations, n = 3). Significant differences between untreated and immunized groups was expressed as * p < 0.001 and ** p < 0.05 and between BBD-CMs and BBD-MCMs groups as ## p < 0.05. (Reprinted with permission from Ref. [116]).
