Medical Emergencies · single question
A patient's hepatitis B serology shows isolated POSITIVE anti-HBs with NEGATIVE HBsAg and NEGATIVE anti-HBc. This pattern indicates the patient is:
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Correct answer: C. Vaccinated / immune
- A. Acute infection shows HBsAg+ and IgM anti-HBc+.
- B. Chronic infection shows persistent HBsAg+.
- C. Correct. Isolated anti-HBs (without anti-HBc) indicates vaccine-acquired immunity.
- D. Never-exposed patients are negative for ALL markers, including anti-HBs.
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