An E. coli infection can cause diarrhoea, blood in poo, vomiting, stomach cramps, and fever.
Salmonella can be spread from person to person by poor hygiene, by failing to wash your hands properly after going to the toilet, or after handling contaminated food.
Listeriosis is a infection caused by bacteria called listeria. It can cause serious problems if you're pregnant or have a weak immune system.
Staph infections are caused by bacteria called staphylococcus. They most often affect the skin.