Human Immunodeficienncy Virus (HIV) Photo

Human immunodeficienncy virus (HIV) photo

Human immunodeficienncy virus (HIV), Cryo-electron tomography, Internal structure of an HIV particle showing the capsid surrounding the RNA-containing core in red and the membrane in blue. The yellow area is electron dense material, including proteases, between the core and the membrane.

Human immunodeficiency virus (HIV) is a retrovirus that can lead to acquired immunodeficiency syndrome (AIDS), a condition in humans in which the immune system begins to fail, leading to life-threatening opportunistic infections. Previous names for the virus include human T-lymphotropic virus-III (HTLV-III), lymphadenopathy-associated virus (LAV), and AIDS-associated retrovirus (ARV).

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. The four major routes of transmission are unprotected sexual intercourse, contaminated needles, breast milk, and transmission from an infected mother to her baby at birth. Screening of blood products for HIV has largely eliminated transmission through blood transfusions or infected blood products in the developed world.

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