2.5 Years Later, Zero Cases Of HIV In Large San Francisco PrEP Group
A new study reveals that after 2.5 years, a group of more than 600 San Francisco men who have sex with men (MSM) taking Truvada as pre-exposure prophylaxis (PrEP) have had zero cases of HIV contraction.
The study also finds that many of these individuals are using condoms less and more than half of those in the group study had contracted at least one sexually transmitted infection (STI) within a year.
Researchers at Kaiser Permanente published their findings in Clinical Infectious Diseases. The paper represents a powerful endorsement of PrEP’s ability, in a real-world setting, to prevent HIV infection among those at very high risk of contracting the virus. The lack of new HIV infections among these men challenges the stance of AIDS Healthcare Foundation president Michael Weinstein, who has vigorously campaigned that PrEPshould not be used as a widescale public health intervention.
On the flip side, the Kaiser findings challenge the received wisdom from PrEP clinical trials that those taking Truvada as HIV prevention do not increase sexual risk-taking while on the medication.
“Our study is the first to extend the understanding of the use of PrEP in a real-world setting and suggests that the treatment may prevent new HIV infections even in a high-risk setting,” reports lead author Jonathan Volk, MD, MPH, a physician and epidemiologist at Kaiser Permanente San Francisco Medical Center. “Until now, evidence supporting the efficacy of PrEP to prevent HIV infection had come from clinical trials and a demonstration project.”
It's important to reiterate that according to Kaiser, though no one using PrEP contracted HIV, there was a very high rate of other sexually transmitted infections (STIs).
POZ.com breaks it down:
After six months, the clinicians at Kaiser surveyed 143 of the cohort about their sexual risk-taking. At that time, 74 percent reported that their number of recent sexual partners had not changed since starting PrEP, while 15 percent said they had fewer sexual partners and 11 percent said they had more. Regarding condom use, 56 percent said they used them at the same rate after starting Truvada, 41 percent used them less and 3 percent used them more.
Because these individuals were not engaged in a clinical trial, there is no control group to measure the change in these men’s sexual risk-taking against. So there is no way to tell if the group would have changed their risk-taking in a similar pattern if they had not been taking PrEP.
One thing is clear, however: These men would have been at very high risk of contracting HIV had they not been taking PrEP while engaging in the same level of sexual risk-taking. The evidence is in their very high rate of STIs. Six months into taking PrEP, 30 percent of the PrEP users had been diagnosed with at least one STI. After a year, half of them had contracted one or more STIs, with 33 percent diagnosed with a rectal STI, 33 percent with chlamydia, 28 percent with gonorrhea, and 5.5 percent with syphilis. As noted, two of them contracted hep C.
“Without a control group, we don’t know if these STI rates were higher than what we would have seen without PrEP,” stressed the paper’s co-author Julia Marcus, PhD, MPH, postdoctoral fellow at the Kaiser Permanente Division of Research. “Ongoing screening and treatments for STIs, including hepatitis C, are an essential component of a PrEP treatment program.”
No one in the group has been diagnosed with HIV.
Our takeaway, PrEP is clearly doing its job in HIV prevention, however we need to remain vigilant in testing and treatment for STIs. The choice to use or not use condoms is up to the individual, but be aware of the risks and ensure that you're regularly being tested to protect your health and potentially that of your sexual partners.
Thoughts on the study's findings, Instincters?