1. AIDS Acquired immune deficiency syndrome or acquired immunodeficiency syndrome (AIDS or Aids) is a collection of symptoms and infections resulting from the specific damage to the immune system caused by the human immunodeficiency virus (HIV) in humans, and similar viruses in other species (SIV, FIV, etc.).
The late stage of the condition leaves individuals susceptible to opportunistic infections and tumors.
Although treatments for AIDS and HIV exist to decelerate the virus' progression, there is currently no known cure.