West Nile virus (WNV) is spread by mosquitoes in many countries. There are usually no symptoms and it gets better without treatment.
Very few people coming back to the UK have the virus. No one has got the virus while in the UK.
WNV is found in many parts of the world. You can check the area you're travelling to on the Travel Health Pro website.
There's no vaccine for WNV. You should avoid mosquito bites when visiting high-risk areas by wearing insect sprays and using mosquito nets.
Most people with WNV have no symptoms.
Some people develop mild flu-like symptoms, nausea and skin rash.
The infection usually goes away on its own without treatment.
The virus is not contagious. You only get it from being bitten by an infected mosquito.
Very young and elderly people, and people with conditions like diabetes are more at risk of developing severe infection.
Signs of a severe infection can include flu-like symptoms and also:
Severe WNV infections are treated in hospital. In rare cases it can lead to meningitis.
Check your travel insurance for how to get medical help while you're away or look up the country you're visiting on GOV.UK