Salmonella and Shigella are the two important gram-negative bacteria that do not ferment lactose and cause enterocolitis. How are they differentiated?
Answer: Salmonella produces gas from glucose fermentation, produces H2S, and is motile (can disseminate hematogenously)
Mnemonic:
Salmon require energy (glucose) to swim (motile) and smell bad (H2S)
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