Epidemiology of HIV/AIDS

The Epidemiology of HIV/AIDS refers to the study of the factors influencing the occurrence and distribution of Human Immunodeficiency Virus (HIV) and Acquired Immunodeficiency Syndrome (AIDS) in populations.

Epidemiology: Derived from the Greek words epi (upon), demos (people), and logos (study).
HIV/AIDS: HIV stands for Human Immunodeficiency Virus, which refers to the virus that causes AIDS. AIDS stands for Acquired Immunodeficiency Syndrome, which refers to the most advanced stage of HIV infection.

Virus: A type of microorganism that invades living cells to reproduce. HIV is a type of virus.
Immunodeficiency: A state in which the immune system's ability to fight infectious disease is compromised or entirely absent.
Syndrome: A group of symptoms that consistently occur together or a condition characterized by a set of associated symptoms.
Infection: The process by which bacteria, viruses, or other microorganisms enter the body and cause disease. HIV/AIDS is a type of infection.
Transmission (medicine): The passing of a disease from an infected host individual or group to a particular individual or group, regardless of whether the other individual was previously infected.
Pandemic: An epidemic of an infectious disease that has spread across a large region, for instance multiple continents, or worldwide. The HIV/AIDS epidemic is considered a global pandemic.

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