Sterile ROTITEST ® Listeria ROTITEST ® BioAnalysis Grade, sterile, ready-to-use ROTITEST ® swab tests are fast and simple test systems for the detection of impurities on surfaces. Easy and safe to handle - even for laymen Definite interpretation through colour shift Storage and transport at room temperature Suitable for testing all surfaces Simple test system for detection, or exclusion, of listeriae contamination on surfaces. Optimal for control and minimisation of the contamination risk caused by Listeria ssp. , particularly L. monocytogenes . This ROTITEST ® Listeria is very easy to apply: Using the integrated swab the respective surface is probed and the swab is firmly pressed into the sterile nutrient medium. After incubation for 24-48 hours (37 °C) a distinct blackening of the medium indicates the presence of listeriae, hence the contamination of the respective surface. Each package contains simple-to-follow instructions-for-use. Note: This test system only allows exclusion, or affirmation, of a listeriae contamination per se. Quantitation is not possible. Figure: Colour shift to black caused by presence of listeria. Please note The ROTITEST ® systems do not provide quantitative information about the level of contamination.