Clinical Microbiology



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Packaging / Colonies appearance

Isolation and differentiation of Methicillin Resistant Staphylococcus aureus (MRSA) including low level MRSA.

Typical Appearance of microrganisms

Methicillin Resistant Staphylococcus aureus (MRSA)
 rose to mauve
Methicillin Susceptible Staphylococcus aureus (MSSA) 
Other bacteria  blue, colourless or inhibited

Order References 

Please use these references when
contacting your local distributor:

5000 mL......... MR502
10 Kg............. MR533-10Kg

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


Medium Performance

1. Fast: MRSA mauve colonies in 18-24 h.

2. Reliable: CHROMagarTM MRSA, introduced in 2002, was the first chromogenic medium for MRSA detection. It lead to such significant reductions in both, the response time and laboratory workload, that it allowed an absolutely necessary wide-scale patient screening.

3. Rapidly detect MRSA strains with heterogeneous resistance with better sensitivity than oxacillin.

4. High sensitivity: The medium exhibits sensitivity and specificity values close to 100 %. CHROMagarTM MRSA allows an accurate detection of MRSA with a higher level of sensitivity than oxacillin containing media.

5. Easy interpretation: intense mauve colony colour.

Medium Description

  • All in one Version: Dehydrated culture media pack including a powder base and a supplement lyophilized. Simple to prepare, designed for end users who prepare their own plates.
  • Plurivial version: Dehydrated culture media pack including a powder base A, a liquid supplement, a powder supplement and a supplement lyophilized. This version can be autoclaved, improving the sterility level of the plates, designed for ready to use plate manufacturers. For more information (detailed information, IFU, MSDS) on this product, please contact us.
Gain flexibility using powder rather than ready to use plates: Use the entire pack, or just a portion if there is a need for a smaller number of plates. If kept under appropriate storage temperature, CHROMagarTM MRSA has a more than 18 months shelf life. This flexibility is essential to avoid the waste resulting from expired- unused plates. For detailed preparation procedure, please refer to our IFU.

CE marked Product.
Please refer to our IFU and Material Safety data sheet for complete information about the medium. CHROMagar™, Rambach™, AquaCHROM™ are trademarks created by Dr. A. Rambach.

                                                           Last Update: 20-Jul-2020

Focus on MRSA

Over recent years, the occurrence of hospital infections caused by methicillin resistant Staphylococcus aureus (MRSA) has been increasing steadily, representing around 20 to 55% of the isolates in Europe and in the USA.
Leading cause of nosocomial infections, especially in intensive care units, the MRSA sources are either endogenous (the patient) or through cross contamination (environmental or by person to person contact).
The major issue with this pathogen is its resistance to a large panel of antibiotics, among them beta-lactam antibiotics, limiting the therapeutic options for clinicians.

MRSA Epidemiologic Issues  

Early detection of patient contamination is essential for controlling the spread of MRSA, providing appropriate care, and avoiding complex and expensive treatments. Pre-admission screening for MRSA has proved to be an effective method for reducing the hospital burden of MRSA-colonised patients. The savings due to consistent decolonisation before elective admission outweigh the costs of screening. Today, in the US, the extra-expenses linked to difficult treatments of MRSA infections are estimated at $2.4 billion for about 370,000 hospital stays. (Genetic Engineering and Biotechnology News, August 2009). 
In the UK, the estimation of the additional cost of discharging every hospital patient who acquires MRSA is £9,000.

Implementation of Colorex MRSA/VRE bi-plate on WASP/WASPLab to screen for MRSA and VRE using Eswab duo swab


M.Gaskin, D.Yamamura, J.Korver ECCMID Vienna Austria 22-25 April 2017

Media Makes a Difference in the Detection of Surveillance Isolates of Methicillin Resistant Staphylococcus aureus using the Bruker MALDI-TOF Mass Spectrometry MRSA PSM-mec Detection Module


D. Boulton, Grand River Hospital, Kitchener ON, Canada CACMID 2018

Identification of microorganisms grown on chromogenic media by MALDI-TOF MS


Petra Lüthje, Arthur B. Pranada, Duncan Carruthers-Lay, Marc Desjardins, Olivier Gaillot, David Wareham , Holly Ciesielczuk, Volkan Özenci
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