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Immune reconstitution inflammatory syndrome (IRIS) is a condition seen in some cases of HIV/AIDS or immunosuppression, in which the immune system begins to recover, but then responds to a previously acquired opportunistic infection with an overwhelming inflammatory response that paradoxically makes the symptoms of infection worse.
In patients with HIV, starting antiretroviral therapy is especially important for restoration of the immune system and reducing the incidence rate of opportunistic infections [51] [52] In patients undergoing chemotherapy, completion of and recovery from treatment is the primary method for immune system restoration.
HIV seeks out and destroys CCR5 expressing CD4 + cells during acute infection. A vigorous immune response eventually controls the infection and initiates the clinically latent phase. However, CD4 + T cells in mucosal tissues remain depleted throughout the infection, although enough remain to initially ward off life-threatening infections.
The human immunodeficiency viruses (HIV) are two species of Lentivirus (a subgroup of retrovirus) that infect humans.Over time, they cause acquired immunodeficiency syndrome (AIDS), [1] [2] a condition in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive. [3]
Most of these conditions are opportunistic infections that are easily treated in healthy people. The staging system is different for adults and adolescents and children. [2] Stage I: HIV disease is asymptomatic and not categorized as AIDS. Stage II: include minor mucocutaneous manifestations and recurrent upper respiratory tract infections.
Acquired immunodeficiency syndrome (AIDS) is defined as an HIV infection with either a CD4 + T cell count below 200 cells per μL or the occurrence of specific diseases associated with HIV infection. [32] In the absence of specific treatment, around half of people infected with HIV develop AIDS within ten years. [32]
Declining CD4 T-cell counts are considered to be a marker of progression of HIV infection. A normal CD4 count can range from 500 cells/mm3 to 1000 cells/mm3. In HIV-positive people, AIDS is officially diagnosed when the count drops below 200 cells/μL or when certain opportunistic infections occur. This use of a CD4 count as an AIDS criterion ...
People with AIDS often develop opportunistic infections that present with non-specific symptoms, especially low-grade fevers and weight loss. These include opportunistic infection with Mycobacterium avium-intracellulare and cytomegalovirus (CMV). CMV can cause colitis, as described above, and CMV retinitis can cause blindness. [citation needed]
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