I'm just guessing but apparently Bianca Biaggi was in movies with transsexual partners and this is probably where she caught HIV. She then probably passed it to Darren James during their "Split that Booty" scene and he then returned to USA and passed it on to Lara Roxx during another "Split that Booty" scene as well as Mereisa Arroyo and Jessica Dee
All people who were infected were great in that they stopped working immediately unlike some people on the quarantine list such as JAY ASHLEY who kept working despite the chance that he was possibly passing on the virus to other girls. It turned out that he wasn't infected but that sort of behaviour is criminal