An abbreviation for the Human Immunodeficiency Virus, a virus that attacks the body’s immune cells inhibiting the ability to successfully fight off other infections. HIV is spread through bodily fluids and can be contracted through contact with the bodily fluids of an infected individual through unprotected sex or sharing a needle used for injecting drugs. In its advanced stages, HIV can lead to AIDS, or Acquired Immunodeficiency Syndrome, which is very dangerous as it can lead to certain cancers, infections, and other clinical illnesses.