Typhoid fever is most common in parts of the world that have poor sanitation and limited access to clean water.
Worldwide, children are thought to be most at risk of developing typhoid fever.
This may be because their immune system (the body's natural defence against infection and illness) is still developing.
But children with typhoid fever tend to have milder symptoms than adults.
Typhoid fever is uncommon in the UK, with an estimated 500 cases occurring each year.
In most of these cases, the person developed the infection while visiting relatives in Bangladesh, India or Pakistan.
But you're also at risk of developing the infection if you visit Asia, Africa or South America.
The main symptoms of typhoid fever are:
If typhoid fever isn't treated, the symptoms will continue to get worse over the following weeks and the risk of developing potentially fatal complications will increase.
Typhoid fever requires prompt treatment with antibiotics.
If typhoid fever is diagnosed early, the infection is likely to be mild and can usually be treated at home with a 7- to 14-day course of antibiotic tablets.
More serious cases of typhoid fever usually require admission to hospital so antibiotic injections can be given.
With prompt antibiotic treatment, most people will start to feel better within a few days and serious complications are very rare.
Deaths from typhoid fever are now virtually unheard of in the UK.
If typhoid fever isn't treated, it's estimated that up to 1 in 5 people with the condition will die.
Some of those who survive will have complications caused by the infection.
Read more about treating typhoid fever.
In the UK, 2 vaccines are available that can provide some protection against typhoid fever.
These involve either having a single injection or taking 3 capsules over alternate days.
Vaccination is recommended for anyone planning to travel to parts of the world where typhoid fever is widespread.
It's particularly important if you're planning to live or work closely with local people.
But as neither vaccine offers 100% protection, it's also important to follow some precautions when travelling.
For example, you should only drink bottled or boiled water, and you should avoid foods that could potentially be contaminated.
Read more about the typhoid fever vaccination.
The areas with the highest rates of typhoid fever are:
When travelling to a foreign country, it's a good idea to make a list of relevant contact details and telephone numbers in case of an emergency.
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