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2. Why is rich medium, such as blood agar, commonly used for susceptibility testing?

2. Why is rich medium, such as blood agar, commonly used for susceptibility testing?

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Answer: Rich mediim such as blood agar , commonly used for susceptibility testing because on this media hemolysis takes place which diffrentiate on blood agar .

Alpha hemolysis : greenish zone around the growth, RBC are partial lysis

Beta hemolysis : A clear zone among the growth . RBC are completely hemolyzed .

Gamma hemolysis : No change around the growth . Blood is not hemolyzed .

The diffrence between susceptible or resistant bacterial pathogen can be distinguished by Blood agar .

Susceptibility can be distinguished by hemolysis of blood .

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