A 26-year-old woman is newly diagnosed with early HIV infect…

A 26-year-old woman is newly diagnosed with early HIV infection.  She is believed to have acquired HIV approximately 4 months prior from a brief sexual relationship with a partner who frequently injects methamphetamine.  She has a new boyfriend and they have regularly had vaginal sex without using a condom during the last 3 months.  She is asking how likely it is that she has passed on HIV to her new partner.