Today is World AIDS Day — a time to remember the millions of people who have died from the disease, support those still living with HIV and re-evaluate efforts to stop its spread.

While there has been much progress in response to the AIDS epidemic since it was first recognized 35 years ago, there is still a lot left to do. Now, a major new HIV vaccine trial is underway in South Africa. Researchers hope it will lead to developing a safe and effective vaccine that could be the "final nail in the coffin" for HIV.

For more on the state of the fight against HIV and AIDS, Here & Now's Robin Young speaks with Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases (@NIAIDNews).