What is the Full Form of HIV ?

HIV - Human Immuno-deficiency Virus

Human Immuno-deficiency Virus is the most deadly infected virus that causes acquired immunodeficiency syndrome (AIDS), which is a condition of complete failure of human immune system. AIDS was first clinically observed in 1981 in the United States. It is believed to have originated in non-human primates in West-central Africa and were transferred to humans.

How to test for HIV
There is no proper procedure to test the presence of Human Immuno-deficiency Virus in human body, because HIV has never been isolated from human blood. So, different procedures are used in different parts of the world for its diagnosis.