Alex, some good info and links but I have to disagree with the outbreak being in the downtown core (the gay outbreak no doubt, but not the SP outbreak). The original study indicated the Downtown Eastside (i.e. lo-track). I'm sure there are SW in the lo-track area practising unsafe sex (after all, the shocking revelations from the Bakker case indicates what they may sadly subject themselves to), but IMO unsafe sex is unlikely to be practised by SP in the hi-track area which is closer to the downtown core. The GVA has a number of tracks, each track is different.
As I and others have posted, SW and ex-SW from the hi-track and other areas can also be found on the internet working as ES and also working as MPA.
On another note, there is a safe injection van that rolls around the city distibuting needles and condoms. Does anyone know how the condoms are used in the drug injection process?