Listeria spp. and L. monocytogenes rapid test and screening kits utilise several different technologies, including immunomagnetic separation, EIA- and ELISA-based assays incorporating fluorescent or colorimetric detection, simple lateral flow assays incorporating immunochromatographic technology, and molecular techniques such as DNA hybridisation and PCR-based assays, many of which now include real-time detection. Some methods can be automated to screen large numbers of samples. Almost all rapid test protocols include a selective enrichment culture, sometimes shortened to 24 hours, and then apply rapid detection techniques to replace culture on selective agars and further confirmatory tests. Most can claim to produce a result in around half the time taken by traditional methods and certain PCR-based assays are capable of detecting Listeria within 30 hours.