For Reliable Results,the Niacin Test Should Be Performed Only from Cultures

question 2

Multiple Choice

For reliable results,the niacin test should be performed only from cultures that are at least:

• A)2 weeks old and show at least five colonies on Löwenstein-Jensen medium.
• B)3 weeks old and show at least 50 colonies on Löwenstein-Jensen medium.
• C)3 weeks old and show at least 50 colonies on Middlebrook 7H11 agar.
• D)2 weeks old and show at least five colonies on Middlebrook 7H11 agar.

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