I think multiple factors go into why it is more difficult to reach women living with HIV.
Women are not targeted the same when it comes to prevention measures as men are targeted. The PrEP ads are primarily focused on men. This focus is to the point that a good percentage of women do not know they can even take PrEP. Another percentage of women are afraid to take PrEP because they fear their partner's actions.
Additionally, some women go through life without knowing about their diagnosis. Women need to request that blood work be done at their well-woman appointment to check for HIV. The standard tests done at a well-woman appointment do not check for HIV. Personally, I had it for years before finding out and I went through yearly pap smears.
According to the CDC, women made up about 19% of new diagnoses (in 201😎. A large percentage were heterosexual women who acquired HIV from their partners. This fits my personal case. Originally, I did not know where to turn for information on HIV, much less for positive women. It seemed like everything focused on men. This can make a woman who already feels isolated, feel isolated even more. This is one reason I attempt to write articles for H-I-V.net for women and at times even specifically for heterosexual women. I feel like a woman's voice needs to be heard. Once we have one or two voices that are loud enough, more women will open up.
I hope I managed to answer your question some - Heather R (team member)