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Daily use of preventive ART by gay and bisexual men has been shown to reduce the risk of acquiring HIV, but adherence has been a challenge. Would starting prophylaxis when sexual activity begins reduce risk? New research findings are summarized in this short video.

A 77-year-old man reported having three episodes of blurred vision in his right eye during the past hour, with each episode lasting approximately 5 minutes. On dilated fundus examination, a motile embolus is visible as a pulsating point of light in the right superior branch of the retinal-artery bifurcation.

See the NEJM article, "On-Demand Preexposure Prophylaxis in Men at High Risk for HIV-1 Infection": http://www.nejm.org/doi/full/10.1056/...