The first test that is always performed on organisms growing on solid or liquid mycobacterial media is a(n):
a. niacin test.
b. acid-fast stain.
c. Gram stain.
d. broth test.
B
Regardless of the identification methods used, the first test that is always performed on organ-isms growing on solid or liquid mycobacterial media is an acid-fast stain to confirm that the or-ganisms are, indeed, mycobacteria.
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