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8 Cards in this Set
- Front
- Back
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Blood agar is especially used to cultivate_____________.
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Hemolytic Gram positive cocci-typically Streptococcus species.
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Define Beta-hemolysis. What does it look like on the blood agar?
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The complete destruction of RBCs and hemoglobin. Results in a clearing of the medium around the colonies.
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Define Alpha-hemolysis. What does it look like on a blood agar?
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The partial destruction of RBCs and produces a greenish discoloration of the agar around the colonies.
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Define Gamma-hemolysis and what does it look like on a blood agar?
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Does not destroy RBCs and appears as simple growth with no change to the medium.
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What is the application for the Blood agar?
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Used for isolation and cultivation of many types of fastidious bacteria.
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What is the interpretation of a result of a clearing around the growth?
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Organism hemolyzes RBCs completely. Beta-hemolysis.
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What is the interpretation of a result of a greening around the growth?
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Organism hemolyzes RBCs partially. Alpha-hemolysis.
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What is the interpretation of a result of no change in the medium?
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Organism does not hemolyze RBCs. Gamma-hemolysis.
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