I wondered this too....but that is good advice LizzieLou and Nursegirl6572!
The docs on this site are not alarmists like some are when it comes to HIV. Meaning...they state the risks and testing suggestions...but also use the fact that HIV is indeed a very difficult virus to transmit to form their assessments.
doctors deal with science...theories. in science...they NEVER say never...but that doesnt mean that it happens.