PlusNews examines the growing need to test how well HIV prevention strategies work - a topic addressed Monday at a Social Aspects of HIV/AIDS Research Alliance (SAHARA) conference in Johannesburg, South Africa. "With the global economic crisis squeezing AIDS budgets, and a frustrating lack of progress in significantly reducing new HIV infections, donors and governments are under more pressure than ever to concentrate resources on prevention strategies that are known to work," the news service writes... 
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