Searching for Listeria monocytogenes and Listeria spp.
Searching for Listeria monocytogenes and Listeria spp.
L. monocytogenes is a gram-positive, non-spore-forming and non-encapsulating, aerobic and facultative anaerobic, catalase-positive, oxidase-negative bacterium. Like all listeria species, it is motile under 30°C. They lose their motility at high incubation temperatures.
On semi-solid agar medium, the appearance of an umbrella opened under 3-5 mm is typical. L. Monocytogenes can maintain its vitality even under conditions such as cooling, freezing, heating and drying.
L. monocytogenes is an important cause of foodborne illness, which usually causes mild and feverish discomfort. L. Monocytogenes is not allowed to be present in 25 g (ml) food. L. monocytogenes is widely available both in food and in nature. It is a test parameter that should be analyzed in dairy products, meat, vegetables, water, prepared foods.
In test methods; The methods shown by the International Standards Organization (ISO), the International Dairy Federation (IDF-FIL) and the US Food and Drug Administration (FDA) to search for L. monocytogenes are used.