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More concerning was the detection of Listeria monocytogenes in one of the samples purchased from an online grocer. Listeria is a particularly dangerous bacterium, especially for vulnerable groups like pregnant women, the elderly, and immunocompromised individuals. Its presence in food products is strictly prohibited under Singapore's food regulations.

Listeria monocytogenes is widespread in the environment, often found in soil and on surfaces. It can contaminate food at any point from production to packaging. One of its notable characteristics is its ability to survive cold storage, such as refrigeration, which makes it a persistent threat in seafood and other perishables.