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HIV Infection Rate Rises as Level of Virus in the Body Rises

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March 29, 2000 (Atlanta) -- A new study finds that the amount of HIV in an infected person is the main predictor of who will most likely infect their sexual partner: High HIV levels in the blood make sexual transmission more likely. Although there is no proof that AIDS drugs that help reduce the amount of virus in the body make people with HIV less likely to infect their sex partners, one expert is concerned that this study, published in the March 30 issue of The New England Journal of Medicine, will lead to an increase in unsafe sex among HIV-infected people.

It would be a disaster for people now taking anti-HIV drugs to begin practicing unsafe sex, warns Myron S. Cohen, MD, director of the University of North Carolina, Chapel Hill, center for infectious diseases. Even if the drugs do reduce infectivity, he tells WebMD, they will never by themselves wholly prevent transmission. As chairman of the antiretroviral therapy working group of the HIV Prevention Treatment Network, he is organizing clinical trials to test the idea. Cohen predicts that the study marks the beginning of a new era in AIDS prevention.

"Most of our prevention effort has focused on the behaviors of people at risk -- but what are our obligations for people who are already infected?" he asks. "We want to deal with them with respect, and find ways to help them avoid passing HIV to the next person. This study is helpful in refocusing our attention on this group."

"There is an urgent need to do an antiviral drug trial to see if when we reduce viral load, we reduce transmission," Thomas C. Quinn, MD, lead author of the study, tells WebMD. "Antiretroviral drugs need to be made less expensive and available in the developing world. But perhaps more importantly, if in the process of developing vaccines for HIV we come up with a vaccine that could lower viral load that would be cost effective and applicable throughout the world -- that would be the magic bullet to shoot down this disease throughout the world. I urge researchers to work toward this goal."

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