The women reported having sex during their periodsFirst eeewwwww!
and using insertive sex toys, sometimes so roughly that bleeding occurred.Second eeewwwww!
The article goes on to explain that the woman infected was selling blood plasma. The first time she tested negative; the second time, she tested positive. It makes you wonder how often someone tests negative but hasstarted to seroconvert. According to this article, you can still test negative, but still be infected during this window of seroconversion.