listeria/lɪˈsteːɹi.ə/EtymologyFrom the genus name Listeria.nounAny rod-shaped, gram-positive bacterium, of the genus Listeria, especially those responsible for the bacterial infection listeriosis.“One of the main reasons fridge temperatures are recommend to be set at 5ºC is because of listeria. Listeria is a food poisoning bacterium that is psychrotrophic – in other words it likes cold temperatures. From the growth models, we know that listeria grows nearly twice as fast at 8°C as it does at 5°C, hence the recommended 5ºC, which helps keep us safe from listeria.”