My last blog, "Not Drinking the PrEP Kool-AIDS" elicited a lot of response. I've read your comments and followed conversations on list serves with great interest and enjoyed talking with many of you about how PrEP (pre-exposure prophylaxis) might best be used to prevent new HIV infections and how its application should fit into the overall mix of tools we will wield to end AIDS.
Thank you for the depth, breadth and passion of your responses. Given the wide-range of your opinions, I hope we can continue the public dialogue to determine the optimal strategy for stopping the pandemic.
So much new scientific data have emerged in the last year--from the CAPRISA 004 results (a study of vaginal microbicides) to the findings of HPTN 052 (noting the impact of treatment as prevention in people with HIV) to the results of multiple PrEP studies (indicating that treatment can serve as prevention in people without the virus when used as a pre-exposure prophylaxis) to advancements in cure research. But the science is only half the battle.
In his opening keynote speech at the International AIDS Conference in Rome, UNAIDS Executive Director Michel Sidibe called gaps in access to HIV treatment within and between countries and key populations an affront to humanity that can and must be closed by innovations in developing, pricing and delivering treatments and commodities. "History will judge us not by our scientific breakthroughs," he said, "but how we apply them."
Empirical evidence suggests we can end AIDS--maybe even in our lifetimes. Now, we need the right global health strategy to guide the deployment of our wide arsenal of weaponry to prevent the most new infections and save the most lives as quickly as possible with the most efficient use of our resources.
Because what we're doing isn't working well or fast enough, particularly on American soil.
Case in point: New incidence numbers released last Wednesday by the Centers for Disease Control and Prevention (CDC) show an average of 50,000 new infections a year for 2006 to 2009.
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One way to reduce incidence is to provide treatment to more people living with HIV who need it. It saves their lives, keeps children from being orphaned--and potentially stops the spread of the virus. The HPTN 052 study proved that giving treatment to people with HIV can lower their risk of transmitting HIV by 96 percent if their adherence is diligent and their viral load is kept undetectable.
HPTN 052 established significant reduction of risk of transmission of HIV between individuals. Its results did not necessarily prove that these individual benefits would translate to a population level impact. But other studies have shown reducing enough individual viral loads can lower community viral load and if that happens, the rate of new infections can follow suit. We've seen the theory in practice in places like San Francisco, Vancouver and South Africa. It is true that each of those settings offered unique factors that enabled better access to care (for example, in British Columbia, injection drug users were allowed to inject in a government-approved center), but the fact remains: if we can get more pills to more people living with HIV, and they adhere, we could see a dip in incidence.
To test whether there is a correlation between universal access and lower rates of new HIV infections, and to better understand that correlation, more people would need to be on treatment.
Globally, there are 33.3 million people with the virus; 6 million are on antiretroviral therapy (ARVs); 27.3 million can't access care--9 million of them need treatment immediately.
A report published in the March 15 issue of Clinical Infectious Diseases showed that the majority of Americans with HIV are not taking ARVs.

There are almost 90,000 Americans with HIV who need treatment immediately and aren't getting it (349,622 need therapy; 262,217 are on therapy). Eventually, most of the 1.1 million (and counting) Americans with HIV will need care.
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