HIV virions (red) budding and being released from an immune cell (blue). (NIH Image Gallery) AIDS researchers announced on Wednesday that a fourth person has been "cured" of HIV, but the dangerous procedure for patients also battling cancer may be little comfort for the tens of millions living with the virus worldwide. The 66-year-old man, named the "City of Hope" patient after the Californian center where he was treated, was declared in remission in the lead-up to the International AIDS Conference, which begins in Montreal, Canada on Friday. He is the second person to be announced cured this year, after...