The presence of gram- positive diplococci in a sputum sample most likely indicates an infection of

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Gram-positive diplococci are a characteristic feature of Streptococcus pneumoniae, which commonly causes pneumonia and other respiratory infections. Streptococcus pyogenes and Corynebacterium diphtheriae are both gram-positive bacteria, but they do not typically form diplococci. Bordetella pertussis is a gram-negative bacterium and also does not form diplococci.

The Presence of Gram- Positive Diplococci in a Sputum Sample