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Questions and Answers
What is the classification scheme used for Streptococci based on serologic properties?
What is the classification scheme used for Streptococci based on serologic properties?
- Biochemical properties
- Hemolytic patterns: β, α & γ hemolysis
- Classification is complicated
- Lancefield groupings according to serologic properties (correct)
What is the characteristic appearance of α-hemolytic streptococci on blood agar?
What is the characteristic appearance of α-hemolytic streptococci on blood agar?
- Form a red zone around their colonies
- Form a green zone around their colonies (correct)
- Form a yellow zone around their colonies
- Form a clear zone around their colonies
What kind of streptococci form a clear zone around their colonies on blood agar?
What kind of streptococci form a clear zone around their colonies on blood agar?
- Pyogenic streptococci (correct)
- Nonhemolytic streptococci
- γ-hemolytic streptococci
- α-hemolytic streptococci
What defines the pyogenic streptococci?
What defines the pyogenic streptococci?
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What is the preferred medium for the isolation of Fastidious Streptococcus species?
What is the preferred medium for the isolation of Fastidious Streptococcus species?
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