Doctor Tony Kelleher (C) measures immune responses as he looks through his microscope in a laboratory at St Vincent's Hospital as research assistants David Van Bockel (L) and Sarah Sasson (R) go about their work June 4, 2003. Kelleher and his team have begun recruiting volunteers for a human trial on a potential vaccine for HIV. REUTERS/Will Burgess


Simon Nkutwa, an AIDS patient, is given a bath by a health care giver in his shack at Orangefarm outside Johannesburg June 5, 2007. REUTERS/Siphiwe Sibeko


HIV/AIDS activists shout slogans during a Treatment Action Campaign protest march in Cape Town, South Africa, April 23, 2006. REUTERS/Howard Burditt


A man dressed as a condom runs during an AIDS and HIV prevention campaign at a square in downtown Lima November 28, 2008. REUTERS/Enrique Castro-Mendivil


Relatives watch as a nurse helps move a patient dying of HIV-AIDS in Ward 4B of Port Moresby's General Hospital October 28, 2005. REUTERS/David Gray


Catholic religious groups, government employees and students hold candles to commemorate and honour those who lost their lives because of HIV and AIDS during the 26th International AIDS Candlelight Memorial at the Quezon city circle, metro Manila May 15, 2009. REUTERS/Romeo Ranoco


A laborer works at a condom production line at the Human-Care Latex Corporation, which is one of China's largest producers of condoms, in Tianjin November 23, 2006. REUTERS/Jason Lee


Wendy Hernandez, who has AIDS, sees her doctor for a routine check up on her birthday at a public hospital in San Pedro Sula November 29, 2007. Wendy was infected with HIV when she was raped four years ago in her home town of Santa Barbara. She also has a three year old son who is HIV positive. REUTERS/Edgard Garrido


Sex workers participate in an AIDS awareness programme to mark World AIDS Day in the eastern Indian city of Kolkata December 1, 2008. REUTERS/Parth Sanyal


A patient receives a dose of generic HIV-AIDS drugs at the Phrabat Nampu Temple in Thailand's Lopburi Province February 17, 2007. REUTERS/Adrees Latif


A Romanian nurse holds the hand of a baby, who's mother was HIV positive, in a hospital in Constanta, Romania (250km east of [Bucharest]) November 26, 2005. REUTERS/Bogdan Cristel


A nurse walks past a sign near the special HIV/AIDS ward during her morning rounds at the Beijing You An Hospital November 30, 2007. REUTERS/David Gray