<http://www.dallasnews.com/sharedcontent/dws/news/localnews/stories/DN-hivdrug_15
met.ART.State.Edition2.3779f1a.html>:

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After 25 years of researchers around the globe being confounded by
HIV, scientists in Dallas have shown that the virus's transmission can
be stopped with medications.

The scientific first, though performed only in lab mice, bodes well
for a future when people at high risk for HIV infection would have a
convenient way to protect themselves from the virus.

Even though the experiment – which involves two commonly prescribed
drugs for AIDS – could represent a breakthrough in AIDS prevention,
experts who have long advocated safe-sex practices are worried that
people will seek these drugs without waiting for scientific proof from
human studies.

"This has the potential to undermine years of safe-sex reinforcement
and risk reduction," said Bret Camp, associate executive director for
the Resource Center of Dallas, which operates several AIDS programs.

One of the drugs, tenofovir, is reportedly being sold at gay dance
clubs on both coasts as a protection against HIV. Mr. Camp said he
didn't know if the drug is also being used that way in Dallas, but he
said it was likely.

"I'm sure it's happening everywhere, maybe to a lesser extent here
than in other places," he said. But as word of this and other similar
studies gets out, "there's a huge potential for abuse."

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Anyone using killer HIV medication as a prophylactic needs their head
examining.

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The experiment involved injecting five mice for seven days with two
drugs that are commonly used to treat AIDS patients, tenofovir and
emtricitabine. On the third day, the mice were inoculated vaginally
with HIV, to mimic how most women and girls become infected.

[...]

After three months, none of the mice showed any signs of the virus.
However, seven out of eight mice that did not receive the medicine
became infected after HIV inoculation.

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I suppose even dodgy HIV scientists have to get their kicks somehow.