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4941 Medicine

A 62-year-old woman presents with fever, cough, sputum production, and pleuritic chest pain. CXR reveals a right middle lobe infiltrate, and she is started on antibiotics for the treatment of pneumonia. Her sputum Gram stain is positive for S. pneumoniae. Which of the following immunologic mechanisms is the most specific host defense against pneumococcal infection?

Aintact splenic function
Bintact complement function
CIgG antibody directed against capsular antigens
Dalveolar macrophages
Medicine
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