Researcher Timothy Henrich, of the Harvard-affiliated Brigham and Women's Hospital in Boston, speaks at the International AIDS Society Conference 2013 in Kuala Lumpur, Malaysia, Wednesd

 

              Researcher Timothy Henrich, of the Harvard-affiliated Brigham and Women
Researcher Timothy Henrich, of the Harvard-affiliated Brigham and Women's Hospital in Boston, speaks at the International AIDS Society Conference 2013 in Kuala Lumpur, Malaysia, Wednesday, July 3, 2013. Two HIV-positive patients in the United States who underwent bone marrow transplants for cancer have stopped anti-retroviral therapy and still show no detectable sign of the HIV virus, researchers said Wednesday. (AP Photo/Lai Seng Sin)