Both Klebsiella pneumoniae and Enterobacter aerogenes belong to the family Enterobacteriaceae, share identical IMViC patterns ($--++$: Indole negative, Methyl Red negative, Voges-Proskauer positive, Citrate positive), and produce abundant gas on Triple Sugar Iron (TSI) without $\text{H}_2\text{S}$.
Motility Diagnostic Difference: Klebsiella pneumoniae is strictly non-motile (lacks flagella, producing large, mucoid, dome-shaped polysaccharide encapsulated colonies), whereas Enterobacter aerogenes is motile by peritrichous flagella.
Correct option: (3) Non- motile
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