Acquired Immunodeficiency Syndrome or Acquired Immune Deficiency Syndrome (AIDS) is a set of symptoms and infections or syndromes that arise due to damage to the human immune system due to infection with the HIV virus or infection with other similar viruses that attack other species (SIV, FIV, etc.).

The virus itself is called the Human Immunodeficiency Virus (HIV) which is a virus that weakens immunity in the human body. People affected by this virus will become susceptible to opportunistic infections or easily exposed to tumors. Although existing treatments can slow down the progression of the virus, but this disease cannot really be cured.

HIV and similar viruses are generally transmitted through direct contact between the skin layer (mucous membrane) or the bloodstream with a bodily fluid containing HIV, such as blood, semen, vaginal fluid, preseminal fluid, and breast milk. Transmission can occur through intimate contact (vaginal, anal, or oral), blood transfusion, contaminated needles, between mother and baby during pregnancy, child birth, or breastfeeding and other forms of contact with these body fluids.

Scientists generally think that AIDS comes from Sub-Saharan Africa. AIDS has now become an epidemic. AIDS is estimated to have infected 38.6 million people worldwide. In January 2006, UNAIDS in collaboration with WHO estimated that AIDS had caused the deaths of more than 25 million people since it was first recognized on June 5, 1981. Thus, this disease is one of the deadliest outbreaks in history. AIDS is claimed to have caused 2.4 to 3.3 million deaths in 2005 only, and more than 570,000 of them are children. One third of these deaths occur in Sub-Saharan Africa, thus slowing economic growth and destroying the power of human resources there. Antiretroviral treatment can actually reduce mortality and severity of HIV infection, but access to treatment is not available in all countries.

"AIDS/HIV Infection" is at the 5th Position in this list.

AIDS/HIV Infection
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