Holidaymakers warned over West Nile virus

Travellers to Europe and North America are being warned to protect themselves against the deadly West Nile virus.

The disease, transmitted mainly via mosquito bites, has been confirmed in two Irish tourists returning from the Algarve in what are thought to be the first cases in the British Isles. Neither victim had to go to hospital for treatment.

The disease has killed hundreds of people in America and is spreading across Europe, prompting the emergency plans.

Most people who catch it never display symptoms, although one in five may develop a flu- like illness. Travellers are told to "cover up" against mosquitoes and avoid areas near water, although the authorities say the advice is precautionary.