Spontaneous abortion may occur as a result. Listeria is commonly found in soil, vegetation, water and mud. Listeria also infects domestic and wild animals, livestock and fowl. Most cases of listeriosis result from eating contaminated food products. Unlike most other bacteria, Listeria multiplies at refrigerator temperatures.
Listeria can also grow on soft cheeses during their ripening period.
The average time period between exposure and symptoms is thought to be 3 weeks, but can range from 3 to 70 days. Persons who are ill should see their health care provider. Stool cultures are not recommended, but your physician may culture your blood to determine if you have listeriosis. Specific treatment consists of antibiotics. Penicillin or ampicillin alone, or together with other antibiotics may be prescribed by your health care provider.