It's very logical to assume the 2.5% of the women being infected are mainly if not only working girls.... I'm sure a few addicted to narcotics contribute to this figure but I doubt it's substancial. Nevertheless, don't they need to show a certificate of some sort to the bar owner that they're in "good health" within a certain period of time? Anyway, assuming there are about 1,000,000 women between 18-30 in Patong and about 25,000 working girls then it will (logically) suggest that every single working girl is infected...
... Scary thought....