Product overview

Harlequin® Chromogenic Agar for Salmonella Esterase (CASE) is a selective chromogenic medium for the detection of Salmonella spp., suitable for use in ISO 6579-1:2017 workflows and as part of Neogen’s One Broth One Plate (OBOP-S) solution. It is intended for microbiological testing and not for the diagnosis of human disease. The medium uses a dual chromogenic system to differentiate Salmonella from non-target organisms. Salmonella colonies appear blue-green due to esterase activity, while non-target organisms with β-glucosidase activity form black colonies. Other organisms are inhibited or appear colorless. An opacity agent provides a white background for easy reading. CASE supports detection of a wide range of Salmonella strains, including non-motile types, monophasic variants, and strains with weak esterase activity or lactose-positive characteristics. This product is part of Neogen’s OBOP-S workflow, validated to ISO 16140-2 and certified by MicroVal and AOAC.