Results from laboratory studies should not be used to assess specific personal risk of infection because (1) the amount of virus studied is not found in human specimens or elsewhere in nature, and (2) no one has been identified as infected with HIV due to contact with an environmental surface. Additionally, HIV is unable to reproduce outside its living host (unlike many bacteria or fungi, which may do so under suitable conditions), except under laboratory conditions, therefore, it does not spread or maintain infectiousness outside its host.
http://www.cdc.gov/hiv/resources/factsheets/transmission.htm
Silent Observer,
I would just take the CDC's word for it, there pretty thurough about these things. No offense, but i would'nt worry about, i've never heard -or- read about any oddball exposures associated with your question.