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Joined 2026-09-21 Message
Incoming links: Acquired immunodeficiency syndrome
Acquired immunodeficiency syndrome 2026-11-05
Acquired immunodeficiency syndrome, commonly AIDS, is the most severe stage of infection with a human immunodeficiency virus. Damage to immune defenses allows serious opportunistic infections and other characteristic illnesses. HIV-1 is a virus; acquired immunodeficiency syndrome is a clinical syndrome associated with advanced disease, not another name for the viral particle or for every positive infection test. Effective antiretroviral treatment can prevent progression to this stage.[ref]
About HIV by the Centers for Disease Control and Prevention. Overview and How it progresses: distinction among HIV infection, chronic infection and AIDS.
An early observation was a cluster of unusual infections rather than a direct measurement of a newly identified virus. The CDC's5June1981 report described five young men treated at three Los Angeles hospitals for biopsy-confirmed Pneumocystis pneumonia. The report also described other infections and profoundly reduced in-vitro proliferative responses in the three patients whose lymphocyte function was tested.[ref]
Pneumocystis Pneumonia - Los Angeles by CDC. Opening case summary, laboratory findings and Editorial Note.
The denominator matters: three abnormal tests out of three tested patients is not evidence that all five were tested, nor does it estimate the frequency of immune dysfunction in a general population. The pattern motivated investigation of a shared immunodeficiency, while the case series alone did not establish its cause or route of transmission.
The scientific distinction remains useful. An organism that is usually controlled can become pathogenic when host defenses fail; investigating the infection and investigating the underlying immune defect answer different questions. Conversely, a single nonspecific symptom cannot establish acquired immunodeficiency syndrome, and a human immunodeficiency virus infection need not have progressed to that syndrome.
HIV-1 2026-11-05
HIV-1, human immunodeficiency virus type 1, is a human retrovirus in the genus Lentivirus and family Retroviridae. It can cause acquired immunodeficiency syndrome, an advanced stage of HIV infection; the virus and the disease stage are distinct concepts.[ref]
Its virion has a viral envelope and an internal core containing the RNA genome and replication machinery. During infection, reverse transcription produces a DNA copy, which becomes integrated into host-cell DNA as a provirus. This RNA-to-DNA step is a defining part of retroviral replication.[ref]
Retroviridae report by the International Committee on Taxonomy of Viruses. Summary and Table 1, genome and replication
The primate lentiviruses use CD4 together with a chemokine receptor for cell recognition and entry.[ref]Lentivirus report by the International Committee on Taxonomy of Viruses. Distinguishing features
An idealized counting example distinguishes molecular and particle quantities. An orthoretroviral particle packages a dimer of genomic RNA: a preparation containing 100 intact such particles would contain 200 packaged RNA molecules. Counting RNA molecules therefore need not give the same number as counting virions.[ref]
Retroviridae report by the International Committee on Taxonomy of Viruses. Table 1, orthoretroviral RNA dimer
Actual nucleic-acid measurements can also detect material outside complete particles. Particle assembly, integration and successful infection require different evidence, so the measured object must be specified rather than treating every virus-associated signal as the same biological quantity.