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Definition
By Mayo Clinic staffAIDS is a chronic, life-threatening condition caused by the human immunodeficiency virus (HIV). By damaging your immune system, HIV interferes with your body's ability to fight off viruses, bacteria and fungi that cause disease. HIV makes you more susceptible to certain types of cancers and to infections your body would normally resist, such as pneumonia and meningitis. The virus and the infection itself are known as HIV. "Acquired immunodeficiency syndrome (AIDS)" is the name given to the later stages of an HIV infection.
An estimated 39.5 million people have HIV worldwide. And though the spread of the virus has slowed in some countries, it has escalated or remained unchanged in others. The best hope for stemming the spread of HIV lies in prevention, treatment and education.
