INBDE (Integrated National Board Dental Examination) Practice Exam

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Oral streptococci strains are predominantly:

  1. Beta-hemolytic

  2. Non-hemolytic

  3. Alpha-hemolytic

  4. Gamma-hemolytic

The correct answer is: Alpha-hemolytic

Oral streptococci strains are predominantly alpha-hemolytic. This characteristic can help differentiate them from other types of streptococci. Alpha-hemolytic bacteria partially break down red blood cells, leading to a greenish discoloration around bacterial colonies on blood agar plates. This type of hemolysis is seen in oral streptococci, such as Streptococcus mutans and Streptococcus sanguinis, which are commonly found in the oral cavity.

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