How is HIV transmitted from one person to another?
HIV transmission can occur when blood, semen, vaginal fluid, or breast milk from an infected person enters the body of an uninfected person.
These are the most common ways in which HIV is transmitted from one person to another: By having sexual intercourse with an HIV-infected person, by sharing needles or injection equipment with a person who is infected with HIV and from HIV-infected women to babies before or during birth, or through breast-feeding after birth.