The swarming gram-negative bacillus that can be presumptively identified on the basis of a positive indole test is:
a. Klebsiella pneumoniae.
b. Proteus vulgaris.
c. Enterobacter aerogenes.
d. Shigella sonnei.
B
In the interests of cost containment, many clinical laboratories use an abbreviated identification scheme for identification of commonly isolated enteric organisms (CLSI, 35A). A spot indole test can be used to separate swarming Proteae quickly, such as P. mirabilis and P. penneri, which are negative, from a spot indole–positive P. vulgaris.
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