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HIV1
abbr., med.	Human Immunodeficiency Virus Type 1
HIV-1
med.	One of the two types of HIV, the virus that causes AIDS. AIDS is the most advanced stage of HIV infection. HIV-1 is transmitted through direct contact with HIV-infected body fluids, such as blood, semen, and genital secretions, or from an HIV-infected mother to her child during pregnancy, delivery, or breastfeeding through breast milk. HIV-1 is responsible for the majority of HIV infections worldwide. In the United States, unless otherwise noted, the term "HIV" primarily refers to HIV-1. see also acquired immunodeficiency syndrome, HIV-2