In my work in AIDS Action’s Health Library, I’m often asked this question.
Last week, a group of Swiss HIV experts issued a statement basically saying: “No, condom use isn’t necessary – provided that certain other conditions are met.” [Emphasis mine]
Before going into more detail, I think it’s important to note that some other expert groups have disagreed with the Swiss group’s conclusions. The U.S. Centers for Disease Control and Prevention (CDC) issued a brief statement, saying that the CDC “underscores its recommendation that people living with HIV who are sexually active use condoms consistently and correctly with all sex partners.” Likewise, UNAIDS and the World Health Organization stated that, to prevent transmission of HIV, they “strongly recommend a comprehensive package of HIV prevention approaches, including correct and consistent use of condoms.”
So, what exactly did the Swiss experts say? And why is it controversial?
In brief: Based on their review of several medical studies, the Swiss group concluded that an HIV-infected person who is on HIV treatment and has a consistently undetectable viral load “is not sexually infectious, that is, cannot transmit HIV through sexual contact.”
However, according to their statement, the following conditions must also be met:
• The person must adhere to their HIV treatment, and the effectiveness of that treatment must be regularly evaluated by their doctor.
• Their viral load must be undetectable (<40 copies) for at least 6 months.
• The person must have no other sexually transmitted infections (STIs).
The Swiss group also acknowledges that “medical and biologic data available today do not permit proof that HIV infection during effective antiretroviral therapy is impossible,” but they believe that the risk is “negligibly small.”
Critics of the Swiss statement have emphasized that research on HIV transmission and viral load has focused on heterosexual couples and vaginal intercourse – and does not necessarily apply to anal intercourse.
A number of people have also pointed out that, even if the Swiss experts are right, their conclusions about unprotected sex would apply to only a small number of HIV-infected persons: people who have excellent adherence to their HIV regimen, a consistently undetectable viral load, and no other STIs.
Practically speaking, the “no STIs” restriction could probably be met only within a monogamous relationship in which both partners were tested for STIs before stopping condom use. STI testing would be essential, because many people with STIs have no symptoms.
The bottom line for me:
Several studies have shown that reducing a person’s HIV viral load tends to reduce their risk of transmitting the virus. This is very heartening, but it does not mean that people with undetectable viral loads have no risk of transmitting the virus.
(Read on …)
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