What Differentiates Virulent Strains of Streptococcus Pneumoniae from Nonvirulent Strains

question 56

Multiple Choice

What differentiates virulent strains of Streptococcus pneumoniae from nonvirulent strains?

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