"Taking [anti-AIDS drugs] daily or weekly before exposure to [HIV] -- the time frame isn't known yet -- may keep it from taking hold, just as taking malaria drugs in advance can prevent that disease when someone is bitten by an infected mosquito, scientists believe.
Monkeys suggest they are right."
Boy I love it when journalists put such wonderful tidbits in their stories. Those must be some pretty intelligent monkeys.
(Yes, I'm intentionally mis-reading it. There's more to the story.)