Is an exceedingly rare infection, typically asymptomatic or with very mild symptoms such as fever, headaches and body ache. If the mother gets sick, there is a risk the fetus will be infected and harmed. The infection also increases the risk of premature birth, in other words, before week 37+0. Good hand hygiene is important when preparing food since the bacteria can be found in some food. Avoid unpasteurized milk and dessert cheeses. Regular hard cheeses are not a problem. Thoroughly cook chicken, meat and fish. Avoid hot smoked and cured fish. Always wash fruit and raw vegetables before eating. Listeria is treated with antibiotics.
Source: - https://www.cdc.gov/listeria/