🏥 USMLE Exam Prep

A patient receives a toxoid vaccine to prevent tetanus. This type of vaccine primarily elicits what type of immune response?

A Cell-mediated immunity involving cytotoxic T-cells.
B Humoral immunity involving antibody production by B cells.
C Innate immunity through activation of natural killer cells.
D Delayed-type hypersensitivity reaction involving macrophages.

✓ Correct Answer: Option B

Toxoid vaccines contain inactivated bacterial toxins that stimulate B cells to produce specific antibodies. This provides humoral immunity, neutralizing the toxins and preventing disease.

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