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The method described is applicable to the detection and enumeration of Listeria monocytogenes and other Listeria species in all food types. These include milk and dairy products, and in environmental samples.
These methods are well referenced and represent a good minimum standard for food, water and environmental microbiology. However, in using Standard Methods laboratories should take account of local requirements. It may be necessary to undertake additional investigations.
The performance of a standard method depends on the quality of reagents, equipment, commercial and in-house test procedures. Laboratories should ensure that these have been validated and shown to be fit for purpose. Internal and external quality assurance procedures should also be in place.