Food&Water Q.C.


CHROMagar™ Listeria

Click on the picture for
Packaging / Colonies appearance

For detection and differentiation
of Listeria monocytogenes from
other bacteria in food samples.

Typical Appearance of microrganisms

L. monocytogenes →blue, diameter less than 3 mm, regular and white halo
Other microorganisms → blue, colourless, other colour, inhibited

Order References 

Please use these references when
contacting your local distributor:

5000 mL....... LM852 

To download the certificate of analysis, please indicate your lot number below :


Medium Performance

When compared to ISO Method or classical media (Palcam, Oxford):

1. Simplicity/Quick results.

2. Clear Reading : CHROMagarTM Listeria helps to easily differentiate Listeria monocytogenes from other Listeria directly at the isolation step: the colonies are blue and surrounded by a white halo due to a specific phospholipase activity.

3. Excellent performance : high sensitivity and specificity (rarely false negative and positive).

Medium Description


-Listed in BAM.
Please refer to our notice and Material Safety data sheet for complete information about the medium. CHROMagar™, Rambach™, AquaCHROM™ are trademarks created by Dr. A. Rambach.
All pictures of our products are CHROMagarTM property and should not be used without our acceptance.

                                                                Last update : 30-Jan-19

Focus on Listeria species

Listeria monocytogenes is a widespread bacteria, present in the soil, sewage, or faecal matter. Its ability to form listerial biofilms on contact surfaces makes it difficult to eliminate.

This pathogen can cause serious food poisoning and is therefore frequently isolated in food processing facilities to avoid food contamination. Contamination can occur at all steps of the food manufacturing chain from raw materials to place of consumption. Four categories of “Ready to eat food” (diverse categories of food which are prepared and stored in different ways and under different conditions) can be contaminated such as: milk, ice cream, smoked fish and cured meat products. 

According to the WHO*, the mean risk of cases of illness per 10 million people per year is respectively: 9.1; 0.012; 0.46; 0.00066. For fast food released onto the market, it is important to rapidly distinguish this pathogen from other harmless Listeria species such as L. ivanovii, L. innocua.
*WHO: Risk Assessment of Listeria monocytogenes in Ready-to-eat Foods: Technical Report, Microbiological Risk Assessment Series, No. 5 Nonserial Publication World Health Organization

Detection and isolation of Listeria spp. and Listeria monocytogenes in ready-to-eat foods with various selective culture media


Hossein Jamali a,b, Lay Ching Chai a,b, Kwai Lin Thong a,b,* University of Malaya, Kuala Lumpur, Malaysia Food Control 32 (2013) 19e24

CHROMagar Listeria Method - Numeration validation report



Qualitative validation report - CHROMagar Listeria Method


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