A patient with psoriasis experiences worsening symptoms after streptococcal pharyngitis. Which type of hypersensitivity is implicated?
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Correct answer: Type IV hypersensitivity
Psoriasis is a Type IV (T-cell–mediated) hypersensitivity reaction, with T cells driving keratinocyte proliferation. Infections such as streptococcal pharyngitis can trigger or exacerbate disease activity.
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