On CHROMagar pink colonies, which VRE group is suspected?

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Multiple Choice

On CHROMagar pink colonies, which VRE group is suspected?

Chromogenic media differentiate organisms by color according to enzyme activity, so specific colors on a CHROMagar plate help indicate the resistance mechanism present. Pink colonies on this VRE-specific medium point to VanC-based resistance, which is intrinsic to Enterococcus species like Enterococcus gallinarum and Enterococcus casseliflavus. These VanC producers give pink colonies, distinguishing them from VanA- or VanB-based VRE, which typically don’t appear pink on this medium. If the organism were a Candida species, you’d expect yeast-like, non-pigmented or differently pigmented colonies rather than pink Enterococcus colonies.

Chromogenic media differentiate organisms by color according to enzyme activity, so specific colors on a CHROMagar plate help indicate the resistance mechanism present. Pink colonies on this VRE-specific medium point to VanC-based resistance, which is intrinsic to Enterococcus species like Enterococcus gallinarum and Enterococcus casseliflavus. These VanC producers give pink colonies, distinguishing them from VanA- or VanB-based VRE, which typically don’t appear pink on this medium. If the organism were a Candida species, you’d expect yeast-like, non-pigmented or differently pigmented colonies rather than pink Enterococcus colonies.

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