Well if she is not HIV infected, then your risk is obviously 0.
Even if she is HIV infected, with one single exposure, the risk is well under 1%- somewhere in the range of about 0.05%. Obviously there are factors that can change this- like if she is indeed infected or has a high level of virus etc.
But overall the risk is low enough, that without any more information, I would not generally advise "post-exposure prophylaxis" ( medications taken after the fact to lower the risk of infection). Now if you found out she was indeed infected- I would consider that.
I would nonetheless advise follow up HIV testing- at 4-6 seeks, and again at about 3 months to be sure.
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Edited by TheGermDoctor on 2/14/2011 at 1:06 AM EST