Typhoid fever is a bacterial infection that can spread throughout the body. Without prompt treatment, it can cause serious complications and can be fatal.Typhoid fever is caused by the bacterium "Salmonella" Typhi. Typhoid fever is infectious. An infected person can pass the bacteria out of their body in their faeces (poos), or, less commonly, in urine (wees).
If someone else eats food or drinks water that's been in contact with a small amount of infected faeces or urine, they can become unwell with the bacteria and develop typhoid fever.