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HIV can be transmitted from an infected person to another through the following infectious fluids: 1  Blood. 2  Semen (including preâseminal fluid) 3  Vaginal secretions. 4  Rectal fluids. 5  HIV can also be transmitted through breast milk expressed through feeding, in limited circumstances, where there is exposure to large quantities.
Infection with HIV occurs by the transfer of blood, semen, vaginal fluid, pre-ejaculate, or breast milk. Within these bodily fluids, HIV is present as both free virus particles and virus within infected immune cells. HIV infects vital cells in the human immune system such as helper T cells (specifically CD4 + T cells), macrophages, and dendritic cells.