Jan van Lunzen, project manager of the research to invent a preventive vaccine against HIV infection and AIDS at the Hamburg-Eppendorf university hospital, pauses during a news conference at the Robert-Koch-Institute in Berlin February 16, 2004. Lunzen told the media his team planned to start tests of the tgAAC09 vaccine on humans this year after the completition of the pre-clinical tests on animals. REUTERS/Michael Dalder REUTERS MAD/JOH