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37406 Microbiology

A 24 year old woman presents with a 3-day history of fever, chills, chest pain, and cough productive of rust-colored sputum. Past medical history includes a splenectomy 1 year ago. A chest x-ray film indicates consolidation of the right lower lobe. Blood cultures are positive for & alpha-hemolytic gram-positive diplococci. Immunity to the causative organism is based on?

AAlternative complement pathway activation
BAntibody to an & alpha-helical coiled fimbria
CIgA antibodies to C carbohydrate
DIgG antibodies to a surface acidic polysaccharide
Microbiology
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