HIV ''(Human Immunodeficiency Virus)'' is an infectious human [[retrovirus]] that causes [[Acquired Immunodeficiency Syndrome]] ''(AIDS)''. It is primarily a [[Sexually transmitted disease]].
Currently, HIV/AIDS kills approximately 2-3 million people per year, primarily in developing countries. Currently in the U.S., there are approximately half-a-million people infected with HIV.
== Transmission ==