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What are BAP and CAP?
Supportive media (allow growth of all except the most fastidious organisms)
How does CAP differ from BAP?
The RBCs of CAP have been lysed
Two examples of bacterial genera that grow on CAP but not BAP
Neisseria
Haemophilus
How is BAP useful for bacterial identification?
Certain bacteria exhibit hemolytic properties on BAP
What are the three hemolysis patterns, and how do they appear on BAP?
α - partial hemolysis (greenish zone around isolated colonies)
β - total hemolysis (clear zone around isolated colonies)
γ - no hemolysis
Selective medium (Definition)
A medium that contains inhibitory reagents that restrict growth of some or most organisms and allow selective growth of desired organisms
Differential medium (Definition)
A medium that contains a factor or factors that reveal specific metabolic or cultural characteristics of specific bacterial isolates
Characteristics of Colistin-Nalidixic Acid (CNA) agar
Selective for Gram-positive bacteria
Differential for hemolytic properties
Characteristics of MacConkey (Mac) agar
Selective for Gram-negative bacteria
Differential for lactose fermentation
Describe the appearance of lactose-fermenting bacteria on a MacConkey agar
Light pink to reddish colonies surrounded by a zone of precipitated bile
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