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/AIDS. About HIV/AIDS. HIV is a virus spread through certain body fluids that attacks the bodyâs immune system, specifically the CD4 cells, often called T cells. Over time, HIV can destroy so many of these cells that the body canât fight off infections and disease. These special cells help the immune system fight off infections.