Blood Agar: This type of differential media differentiates organisms on their ability to lyse red blood cells (hemolysis) through the production of the extracellular enzyme hemolysin.
β-hemolytic activity (A) will show lysis and complete digestion of red blood cell contents surrounding colony. e.g. Streptococcus haemolyticus.
α-hemolysis (B) will only partially lyse (the cells are either lysed or not- it is the digestion that may be incomplete) the hemoglobin and will appear green. e.g. Streptococcus viridans.
γ-hemolysis (C) is the term referring to a lack of hemolytic activity.
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