the figures for that are rather ambiguous though, since they say that the disease has originated in this region, but that does not necessarily mean that immigrants from that area have brought them in. Although the "sex tourism" market is more based in thailand nowadays, 15 years ago was the centre of it for British Tourists was The Gambia, and resulting in a significant increase in sexually transmitted disease, aswell as standard diseases, caught be engaging in congress with local prostitutes. So, really, its not immigration that has caused it completely, but your average white male, looking for a good time on holiday.