An expanded U.S. program of HIV screening and treatment could prevent as many as 212,000 new infections over the next 20 years and prove to be very cost-effective, according to a new study by Stanford University School of Medicine researchers. The researchers found that screening high-risk people annually and low-risk people once in their lifetimes was a worthwhile and cost-effective approach to help curtail the epidemic. The screening would have to be coupled with treatment of HIV-infected individuals, as well as programs to help change risky behaviors... 
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