hello, my sister found out her husband is HIV positive, she says they only had unprotected sex, mostly recently from their 3 year marriage...i wanting to know what is the probability of her becoming positive?? and how long before she knows for sure given sexual activity stops??

Your sister is at significant risk for infection with HIV. The odds for infection increase with repeated episodes of receptive intercourse with an infected person. However, it is important that your sister understands that infection, while likely, is not guaranteed and that it is crucial that she stops having unprotected sex with her partner.

For people who know that they have been exposed to HIV, antibody testing at three and six months following the last exposure is often recommended. She may want to talk with an HIV specialist to talk about her options as well.

This sounds like a difficult experience for all parties involved. It is as important to look at the emotional aspects involved with HIV infection and AIDS and to seek the appropriate psychological, social, and interpersonal support needed. Contact a local AIDS service organization for information about support.

RMK