Thirty years ago (6/05/81), medical experts reported the first cases of a mysterious and lethal new infection. The immune-system disease soon had a name — AIDS -- and the virus that causes it -- HIV-- soon became a global scourge, killing more than two million people every year.  But medical research has turned the tide again AIDS. Today, the virus is no longer a certain death sentence, and while it still kills more than a million people each year, a new generation of drugs has enabled more than 30 million people today to live with HIV.  VOA’s Vidushi Sinha has more on the history of HIV/AIDS and the challenges that remain in ending this worldwide plague.