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A |
Alpha-hemolytic colonies of Streptococcus pneumoniae on sheep blood agar. Cultivation 24 hours in an aerobic atmosphere enriched with 5% CO2, 37°C. |
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B |
Craterlike appearance of colonies of Streptococcus pneumoniae. Cultivated on Columbia agar with sheep blood, 24 hours in an aerobic atmosphere enriched with 5% carbon dioxide., 37°C. |
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C |
Virulent, encapsulated form of Streptococcus pneumoniae. Cultivated on Columbia agar with 5% defibrinated sheep blood, 48 hours in an aerobic atmosphere enriched with 5% carbon dioxide, 37°C.
Colonies are surrounded by a zone of alpha-hemolysis. |
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