What Differentiates Virulent Strains of Streptococcus Pneumoniae from Nonvirulent Strains

question 12

Multiple Choice

What differentiates virulent strains of Streptococcus pneumoniae from nonvirulent strains?

• A) the species-specific teichoic acid present in its cell wall
• B) the type of Lancefield antigen it produces
• C) the presence of a polysaccharide capsule
• D) the type of toxins it produces
• E) the extent of the hemolytic zone it produces when it is grown on blood agar

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