Colonies of Streptococcus Pneumoniae Appear Alpha-Hemolytic on Blood Agar Media

question 10

Multiple Choice

Colonies of Streptococcus pneumoniae appear alpha-hemolytic on blood agar media.Which one of the following statements explains this discrepancy?

• A) The lot of blood agar may be expired.
• B) Something may be wrong with the strain of S. pneumoniae since it should be beta-hemolytic on blood agar.
• C) Something may be wrong with the strain of S. pneumoniae; it should be gamma-hemolytic on blood agar.
• D) No discrepancy is present. S. pneumoniae should be alpha-hemolytic on blood agar.

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