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These infections are called âopportunisticâ because they take advantage of your weakened immune system, and they can cause devastating illnesses. OIs are signs of a declining immune system. Most life-threatening OIs occur when your. is below 200 cells/mm3. OIs are the most common cause of death for people with HIV/AIDS.
The human immunodeficiency virus (HIV) is a lentivirus (a subgroup of retrovirus) that causes HIV infection and acquired immunodeficiency syndrome (AIDS).nfection 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.