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Antiretroviral treatment for preventing HIV infection: an evidence review for physicians
Date:5/28/2012

While immediate postexposure treatment for suspected HIV is critical, pre-exposure preventive treatment is a newer method that may be effective for people in high-risk groups, states a review of evidence published in CMAJ (Canadian Medical Association Journal).

"Although postexposure prophylaxis has a long history of success, newer methods such as pre-exposure prophylaxis and earlier treatment in the course of infection ("treatment as prevention") are being implemented with some success," writes Dr. Isaac Bogoch, Harvard Medical School and the Division of Infectious Diseases, Massachusetts General Hospital, Boston, with coauthors.

Several recent large randomized controlled trials have added to knowledge about pre-exposure prevention and early initiation of antiretroviral therapy. To provide physicians with current pharmacologic prevention methods, researchers from Massachusetts General Hospital, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts and Sunnybrook Health Sciences, Toronto conducted a review of literature from January 1990 to April 2012.

HIV is transmitted mainly through unprotected sex, contaminated needles and from mother to baby, although the latter transmission was not part of the review.

After assessing with a detailed history whether a person has been exposed to HIV, postexposure treatment (prophylaxis) should begin as soon as possible or within 72 hours and be continued for 28 days. If the patient is in a low-risk situation but not completely without risk, the physician and patient can decide upon the risks of transmission and whether to treat prophylactically. Current practice recommends a two-drug regimen of tenofovir with emtricitabine and a third drug in people with high-risk exposure.

"Evidence for quickly starting prophylaxis and a four-week duration of therapy stem from macaque models of transmission, in which starting prophylaxis later and shorter durations of
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Contact: Kim Barnhardt
kim.barnhardt@cmaj.ca
613-520-7116 x2224
Canadian Medical Association Journal
Source:Eurekalert

Page: 1 2

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