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5 Cards in this Set
- Front
- Back
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Streptococcus pneumoniae are gram positive or gram negative? what are they arranged in? Strains of this usually posses a _________
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Gram positive, arranged in pairs or short chains.
Strains of this organism usually possess a capsule |
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how do Strep. pnemoniae with capsules appear on blood agar plates?
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large (1-3 mm), round, mucoid, and unpigmented.
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how do Strep. pnemoniae with out capsules appear on blood agar plates?
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smaller and flat
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Autolysis
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all strep pneumoniae colonies undergo this with age where the central portion of the colony dissolves leaving a dimpled appearance on the plate
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strep pnuemoniae exhibit what type of hemolysis
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alpha hemolytic if grown on blood agar in the presence of oxygen and beta hemolytic if grown in anaerobic conditions
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