Travellers should make sure they have had all the relevant vaccinations before heading overseas, an insurance company has urged.
LV= said that holidaymakers risk facing hefty medical bills if they do not protect themselves prior to their journey.
The comments come after a report from the insurer revealed that more than a quarter of travellers have been abroad in the last 12 months without having vaccinations for diseases such as hepatitis A, typhoid and diphtheria.
In addition, the study found that 46 per cent of holidaymakers are doing no research into potential medical problems they might develop abroad.
Emma Hoyler, a spokeswoman for LV=, said: "Getting ill can not only ruin a holiday but could lead to costly medical bills.
"This report highlights how important it is for holidaymakers to make sure they do their research before they head off on holiday - not all destinations will require vaccinations, but missing out on them means taking an unnecessary health risk."