HIV transmission can occur when blood, semen, pre-seminal fluid, vaginal fluid, or breast milk from an infected person enters the body of an uninfected person.
These are the most common ways that HIV is transmitted from one person to another:
- By having sex (anal, vaginal, or oral) with an HIV-infected person
- By sharing needles or equipment with an injection drug user who is infected with HIV
- From HIV-infected women to their babies before or during birth, or through breastfeeding after birth.
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