we'll have an article up about this soon, but the most recent study, found HIV transmission occurred on average 1 out of every 900 sexual acts, based on numbers between heterosexual mixed-status couples in Africa.
the study did confirm previous data which suggests that lower viral loads reduce chances of transmission. however, the researchers and other experts stress that while the chances are lower, it's not zero.
as for disclosure, it's obviously your choice. but for your sake, if you don't want to disclose, which is absolutely fine, use condoms. if she is in the medical field, then she should not be suspicious and know it's meant to protect both of you.
and then if down the line you do disclose and she is accepting, then you can talk about the numbers and decide if she is willing to take the chances without condoms. although, in some states, HIV criminalization laws still apply regardless of consent. but that's a whole other can of worms.
Bartleby at The Body
Bulletin Board Administrator