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Cards In This Set
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What kind of medium is Blood Agar?
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Both Enriched and Differential
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Why are bacteria able to grow well on this medium?
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Iron and other nutrients
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What makes Blood Agar medium differntial
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The ability to break down blood cells (or not)
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What plates are used most often?
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Plates containing 5 to 10% sheep blood
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Which 2 bacteria make tonis called hemolysins?
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Streptococcus and Staphylococcus
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What are Hemolysins?
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They break down RBCs
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What do Alpha-hemolysins do?
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Cause partial lysis of RBCs which leads to darkening of the blood agar aound the colony called Alphy-Hemolysis
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What causes the green color often seen in Alpha-Hemolysis?
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Hemoglobin breakdown
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What does Beta-Hemolysis cause?
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Complete Lysis of teh RBCs and breakdown of hemoglobin which leads to colorless clearing of the blood agar around the colony called Beta-Hemolysis
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What is it called if an organism causes no hemolysis?
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Gamma-Hemolysis
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Which is the leading cause of hospital acquired infections?
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Enterococcus faecalis
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What is the leading cause of pneumonia, meningitis and otitis media?
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Streptococcus pneumoniae
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What is the major cause of tooth decay, what bacteria?
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Streptococcus mutans
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What is the organism that causes bacteria pharyngitis or "strep throat?"
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Streptococcus pyogenes
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Why is Streptococcus pyogenes able to cause disease?
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It has the ability to resist phagocytosis and to make toxins and enzymes including hemolysins called streptolysins
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