Travellers to an exotic island in the Indian Ocean have been issued with warnings against a rare tropical disease. Seventy seven people have already died in Mauritius from the rare chikungunya virus which is carried by mosquitoes. Mauritius, an island paradise particularly popular with honeymooning couple has about 700,000 visitors annually, generating more than £400 million. Following the outbreak the number of French tourists who normally account for about a quarter of the total, plummeted.