Which organism is non-motile and indole negative?

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Multiple Choice

Which organism is non-motile and indole negative?

Motility and indole production are classic tests to differentiate members of the Enterobacteriaceae. A non-motile organism lacks flagella, so it does not move in motility tests. An indole negative result means the organism does not produce indole from tryptophan via tryptophanase. Klebsiella pneumoniae fits this combination: it is non-motile and indole negative. This distinguishes it from Escherichia coli, which is motile and indole positive.

Motility and indole production are classic tests to differentiate members of the Enterobacteriaceae. A non-motile organism lacks flagella, so it does not move in motility tests. An indole negative result means the organism does not produce indole from tryptophan via tryptophanase.

Klebsiella pneumoniae fits this combination: it is non-motile and indole negative. This distinguishes it from Escherichia coli, which is motile and indole positive.

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