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Relationship between maternal hair cortisol and antitetanus IgG levels. (A) Dam hair cortisol was positively correlated with dam TT IgG levels (R50) = 0.33, P < 0.05). (B) Dam hair cortisol was negatively correlated with the ratio of infant-to-dam TT IgG levels (R50 = –0.29, P < 0.05).
