If a novel subunit vaccine administered with an adjuvant elicits a weak initial antibody response in mice, which immune mechanism's enhancement by the adjuvant is most likely deficient?

💡 Explanation

An adjuvant enhances the immune response, particularly germinal center formation and affinity maturation in B cells. Because weak initial antibody response suggests impaired germinal center reactions, therefore enhancing this process is crucial, rather than direct B cell activation or neutrophil recruitment.

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