What characteristic helps differentiate Enterobacter sakazakii from Enterobacter cloacae?

What characteristic helps differentiate Enterobacter sakazakii from Enterobacter cloacae?

• A. Yellow pigmentation and negative sorbitol fermentation
• B. Pink pigmentation and positive arginine dihydrolase
• C. Yellow pigmentation and positive urease
• D. H2S production on TSI

Answer: (A)

The characteristic that helps differentiate Enterobacter sakazakii from Enterobacter cloacae is specifically yellow pigmentation and negative sorbitol fermentation. Enterobacter sakazakii typically exhibits a distinctive yellow pigmentation when grown on certain media, which is an identifying feature that can aid in its identification. Additionally, Enterobacter sakazakii does not ferment sorbitol, which provides a further basis for differentiation from Enterobacter cloacae, which may demonstrate varying fermentation profiles. Other potential characteristics mentioned in the options, such as urease activity or hydrogen sulfide production, are generally not utilized as primary differentiation methods for these two species. The distinct characteristics of yellow pigmentation and sorbitol fermentation are significant in clinical microbiology for identifying Enterobacter sakazakii, particularly in neonatal infections, where rapid identification is crucial.

The characteristic that helps differentiate Enterobacter sakazakii from Enterobacter cloacae is specifically yellow pigmentation and negative sorbitol fermentation. Enterobacter sakazakii typically exhibits a distinctive yellow pigmentation when grown on certain media, which is an identifying feature that can aid in its identification. Additionally, Enterobacter sakazakii does not ferment sorbitol, which provides a further basis for differentiation from Enterobacter cloacae, which may demonstrate varying fermentation profiles.

Other potential characteristics mentioned in the options, such as urease activity or hydrogen sulfide production, are generally not utilized as primary differentiation methods for these two species. The distinct characteristics of yellow pigmentation and sorbitol fermentation are significant in clinical microbiology for identifying Enterobacter sakazakii, particularly in neonatal infections, where rapid identification is crucial.