Listeriosis is a rare infection caused by bacteria called listeria. It usually goes away on its own, but can cause serious problems if you're pregnant or have a weak immune system.
Listeriosis is usually caught from eating food containing listeria bacteria.
You can get it from lots of types of food, but it's mainly a problem with:
- unpasteurised milk
- dairy products made from unpasteurised milk
- soft cheeses, like camembert and brie
- chilled ready-to-eat foods, like prepacked sandwiches, pâté and deli meats
These foods do not always cause listeriosis. If you have eaten them recently, you do not need to do anything unless you get symptoms of the infection.
You can also catch listeriosis from:
- someone else who has it – for example, if you eat food they've handled when they've not washed their hands
- close contact with farm animals – especially sheep and cows that are giving birth
In most people, listeriosis has no symptoms or only causes mild symptoms for a few days, such as:
- a high temperature of 38C or above
- aches and pains
- feeling or being sick
If you're not pregnant and do not have a weakened immune system, you can usually look after yourself at home if you have these symptoms.
There are some simple things you can do to reduce your risk of getting listeriosis.
wash your hands regularly with soap and water
wash fruit and vegetables before eating them
store ready-to-eat foods as recommended by the manufacturer
make sure all hot food is steaming hot all the way through
do not eat food after its use-by date, even if it looks and smells normal
Foods to avoid if you're pregnant
If you're pregnant, you should avoid eating foods that have the highest risk of causing listeriosis.
- some uncooked soft cheeses – including brie and camembert
- all types of pâté – including vegetable pâté
- unpasteurised milk or dairy products
- any undercooked food
If you're pregnant, you should also avoid close contact with farm animals that are giving birth or have recently given birth.