Name the virus that causes AIDS. What are the medium through which this virus is transmitted?

AIDS (Acquired Immuno Deficiency Syndrome) is caused by HIV (Human Immuno Deficiency Virus). The HIV can be transmitted through the following medium:

1. Unprotected sexual intercourse involving multiple partners.

2. Blood transfusion without prior checking for HIV infection.

3. Drug abuse involving sharing of contaminated needles.

4. From an infected mother to the developing foetus through placenta.