FILE -- In this Dec. 1, 2014 file photo a man makes a call on a mobile phone as he passes World AIDS Day banners on the perimeter of an office building in Sandton, Johannesburg, South Africa.  A new vaccine against HIV, called HVTN 702, is to be tested in South Africa, it is announced Sunday Nov. 27, 2016, and scientists aims to enroll 5,400 sexually active men and women for the clinical trial.
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