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A 67-year-old receives an inactivated influenza vaccine. Two weeks later, serum shows a surge of antigen-specific antibodies with increasing affinity. Which effector cell directly produces these antibodies?

A 49-year-old woman with fatigue, weight gain, cold intolerance, and a firm, non-tender goiter is found to have elevated TSH and low free T4. Which serology best supports the most likely diagnosis?

Mood disorders are most associated with dysregulation of which neurobiologic system?

Brief vertigo (10–20 s) triggered by rolling in bed or looking up; Dix-Hallpike elicits torsional upbeat nystagmus. The mechanism is most consistent with:

A child with pica presents with abdominal pain and microcytic anemia. Which cellular mechanism explains lead toxicity?

A 22-year-old washes his hands 30 times daily despite skin irritation. He reports recognizing the behavior as excessive but cannot resist. Which mechanism best explains this?

A 54-year-old starts lisinopril and develops non-pitting facial and tongue swelling without urticaria or pruritus. Which mechanism best explains this angioedema?

In the United States, the most common infectious cause of viral meningitis in adolescents/young adults is:

A 54-year-old experiences sudden “worst headache of life” after exertion with nuchal rigidity. First-line diagnostic test?

A phlebotomist has high-risk percutaneous exposure to HIV from a known viremic patient. Which is the best next step?