coup d'Ã©tat. a sudden and decisive action in politics, especially one resulting in a change of government illegally or by force. Origin of coup d'Ã©tat.
The human immunodeficiency virus (HIV) is a lentivirus (a subgroup of retrovirus) that causes HIV infection and acquired immunodeficiency syndrome (AIDS).AIDS is a condition in humans in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive.he human immunodeficiency virus (HIV) is a lentivirus (a subgroup of retrovirus) that causes HIV infection and acquired immunodeficiency syndrome (AIDS).
HIV and AIDS. 1  AIDS is an immune deficiency condition caused by infection with the Human Immunodeficiency Virus (HIV) 2  Epidemiology HIV can occur in any population. increased prevalence in hemophiliacs, IV drug abusers, and homosexual men. 3  Pathophysiology the CD4 cells (T-helper cells) are affected.