Okay, I'm not a member of your organization, but I was browsing because you all have such an active site here (says a lot for you).
Anyway, I went on a study abroad program for 5 months in Zimbabwe a few years ago, and the problem is indeed bad. I was told in the village in which I first stayed, nearly a third of all babies were born HIV positive. I checked the WHO stats and they say that 25% of Zimbabwe's adult population is living with HIV or AIDS.
I must say, though, that I could see efforts being made to educate. When I went to the University of Zimbabwe, condoms were available for free in the student union, and I even snatched a poster saying "Condoms Show You Care" and it hangs on my wall to this day (they had plenty, don't get angry at me
). Several villages had educatators creating programs to educate. But obviously, still not enough.
I wont even get into the causes for the explosion like having to commute to the city for work and what not (didn't I just say I wouldn't get into it?). And I am going to leave out my opinion of Robert Mugabe. Anyway, just wanted to add another side to the story and a little bit of hope.