Which Statement Is TRUE About Streptococcus Pneumoniae and the Lung

Which statement is TRUE about Streptococcus pneumoniae and the lung infection it causes?

A) Streptococcus pneumoniae can spread from the focus of infection as a bacteremia.
B) Infection with any strain of encapsulated virulent Streptococcus pneumoniae provides long- lasting immunity to all encapsulated virulent strains.
C) Penicillin and erythromycin are the "last chance" drugs for treatment of streptococcal pneumonia.
D) Streptococcal pneumonia is not as serious as most people think; if left untreated, it usually runs its course in about a week to ten days.

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