Listeria and Salmonella testing

Friday, 14 May, 2004 | Supplied by:

The Listeria Isolation Transwab is a simple screening tool for the detection of Listeria contamination. The test is self-contained, with an easily seen colour change providing the yes-or-no answer within 48 hours. Swab samples can be collected from the environment, such as work surfaces, walls, pipes, drains and personnel, and also from the foodstuff itself.

The swab is simply placed in the tube of straw-coloured semi-solid medium, and is incubated at 37°C for up to 48 hours. The presence of Listeria is indicated by the development of a black-brown precipitate. This system is very sensitive, detecting less than 10 cfu of Listeria monocytogenes per swab area.

The Salmonella Isolation Transwab is used in the same manner but uses a modified XLT-4 media. The presence of salmonella turns the pink media black on incubation at 37°C.

Both systems are available in boxes of 25 and 125 swabs and have a 12 month shelf life stored at room temperature.

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