**The Biochemical Game of AIDS: Identifying the Three Stages of Infection, the Pattern of CD4 Cell Depletion, and "Cocktail Therapy" [i]**
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The stages of HIV infection are determined based on the decrease in defense cells (CD4 cells) and viral replication [i]. This process is divided into three stages: A, B, and C [i]. Stage A means that there are varying numbers of CD4 cells present; in stage B, typical symptoms have already appeared; and in stage C, the disease has fully progressed to AIDS [i].
Acute HIV infection: Usually occurs 1–3 weeks after viral infection [i]. Typical symptoms appear in 50%–80% of patients: fever, swollen lymph nodes, sore throat, muscle pain, nausea, and vomiting [i]. Seroconversion phase: 6–12 weeks after viral infection, the body develops a resistance response, and the initial symptoms subside [i]. Early HIV infection phase: Starting from the sixth month, the virus replicates at almost the same rate [i]. The higher the viral replication rate during this period, the faster the onset of AIDS [i].
Symptomatic HIV: Typical symptoms include persistent and widespread lymphadenopathy, memory impairment leading to dementia, and lung, kidney, neurological, and hematopoietic dysfunction [i]. In addition, there is pneumonia caused by bacteria that do not cause illness in healthy individuals [i]. Asymptomatic HIV: No symptoms or mild symptoms, but confirmed by blood tests, with HIV continuing to multiply despite a decrease in CD4 cells [i]. A 1995 study published in *Nature* confirmed that HIV replicates at a frenzied rate of 10⁸ to 10⁹ times per day [i]. In the middle stages of the disease, this means 680 million new viruses are generated daily [i]. Typically, without medication, the human immune system collapses within 8–10 years [i].
A diagnosis of HIV infection requires an "AIDS test" [i]. In the case of infection, a positive result is usually obtained after 6 to 12 weeks [i]. Today, polymerase chain reaction (PCR) can detect not only antibodies but also the virus in the early stages of infection [i]. The lower the concentration of HIV in the blood, the later the patient progresses to the late stage of AIDS [i].
Modern antiviral drugs are used in a treatment regimen called cocktail therapy[i]. Introduced in 1995, this therapy consists of three drugs plus a new protease inhibitor, enabling humans to influence the development of AIDS for the first time[i]. Using anti-AIDS cocktail therapy can halt the replication process of the HIV virus, potentially delaying the outbreak of AIDS by several years[i]. In some patients using this therapy, the HIV virus is even undetectable in routine blood tests[i]. Although there is currently no cure or effective vaccine for AIDS, medical researchers predict a breakthrough in curing AIDS within the next five years[i].