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Listeria (food poisoning)

Key facts

  • Listeria is a type of bacteria that can cause food poisoning (listeriosis).
  • You can get listeriosis by eating foods contaminated with Listeria.
  • Listeria infections can be mild in pregnant people but may seriously harm your baby.
  • If you have listeriosis, you may need 2 weeks of intravenous (in your vein) antibiotics.
  • While pregnant, it's important to avoid high-risk foods and keep good kitchen hygiene to lower your chance of Listeria infection.

    • What is Listeria food poisoning?

    Listeria (Listeria monocytogenes) is a type of bacteria (Opens in new tab) that can cause serious food poisoning (Opens in new tab) called listeriosis. You can get it if you eat food contaminated with Listeria.

    Although listeriosis is rare, it can lead to serious illness and harm your baby during pregnancy. Some people can die from it.

    People at a higher chance of listeriosis include:

    Listeria is found in soil, water and animals. It can contaminate foods during production or handling.

    What are the symptoms of listeriosis?

    Symptoms of listeriosis may include:

    Sometimes, you may not even feel sick at all or your symptoms may be very mild.

    It usually takes about 3 weeks to develop symptoms, but it can range from 7 to 70 days.

    Symptoms and effects on your baby during pregnancy

    If you get Listeria food poisoning during pregnancy, it can harm your baby even if you don't feel sick.

    Listeria can infect your baby before birth. This may lead to symptoms such as:

    What causes listeriosis?

    You can get listeriosis by eating foods that are contaminated with the Listeria bacteria. Some foods are more likely to carry it, especially if they're:

    • undercooked or ready-to-eat meat
    • unwashed or raw vegetables
    • dairy products

    If you are pregnant, your baby can also develop listeriosis. This is because the Listeria bacteria can pass through your placenta before birth.

    During pregnancy, you have a higher chance of developing listeriosis than usual.

    When should I see my doctor?

    You should see your doctor (Opens in new tab) or midwife straight away if you:

    • think you have eaten foods contaminated with Listeria bacteria
    • have symptoms of Listeria infection
    • are worried

    How is listeriosis diagnosed?

    Your doctor can diagnose you with listeriosis by doing tests including:

    How is listeriosis treated?

    If your doctor thinks you might have listeriosis, they may start treatment straight away before your test results are back.

    Treatment usually includes 2 weeks of intravenous antibiotics (Opens in new tab) (given to you through a vein). Your doctor will only give you antibiotics that are safe for you and your baby.

    Sometimes you may need to have your baby early. This depends on how severe your illness is and how far along your pregnancy is.

    Starting treatment early helps improve outcomes for your baby.

    Read more about medicines during pregnancy.

    What are the complications of listeriosis?

    During pregnancy, listeriosis can cause serious complications, especially for your baby.

    Complications for your health are rare but may include:

    In general, you have a higher chance of food poisoning during pregnancy. Listeriosis is one of the most dangerous foodborne infections for unborn babies. It can lead to:

    This is why it's important to know which foods to avoid during pregnancy.

    Can listeriosis be prevented?

    You can help prevent listeriosis by avoiding high-risk foods and eating freshly cooked food.

    High-risk foods include:

    • dairy made with unpasteurised milk, raw milk and soft cheeses
    • chilled, precooked, smoked and uncooked seafood
    • pâté, dips and cold delicatessen meats
    • precooked meat and meat products which are eaten without further cooking or heating
    • pre-prepared and pre-packaged fruit salads, vegetable salads and coleslaws
    • soft-serve ice-cream and fresh fruit juices
    • raw sprouts, mushrooms and rockmelon

    Read more about how to store and prepare your foods safely.

    Resources and support

    Information for Aboriginal and/or Torres Strait Islander peoples

    Speak to a maternal child health nurse

    Call Pregnancy, Birth and Baby to speak to a maternal child health nurse on 1800 882 436 (Opens in new tab) or video call. Available 7am to midnight (AET), 7 days a week.

    Last reviewed: August 2025

    Need more information?

    These trusted information partners have more on this topic.

    Listeriosis fact sheet

    Listeriosis is a rare but serious illness caused by Listeria bacteria in contaminated food. Learn symptoms, risks, prevention, and high‑risk foods, especially for pregnant women, elderly people, and those with weakened immunity.
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