Malaria is widely distributed in tropical regions around the world, including parts of Africa, Asia, Central and South America, the Caribbean and the Middle East.
All travellers to countries or areas where malaria occurs are at risk of infection. Migrants to the UK that were born in malaria risk areas are at high risk when visiting friends and relatives in their country of birth. This is because of an assumption that they have immunity from having being born there. Immunity however, disappears very quickly upon moving to an area with no malaria risk.