The Human Immunodeficiency Virus is a retrovirus that primarily targets the immune system, specifically destroying CD4+ T-lymphocytes. Once the virus enters the body, its surface glycoproteins bind to CD4 receptors on the host cell membrane. Through fusion and reverse transcription, the viral RNA is converted into DNA, integrating into the host's genome using the enzyme integrase. This commandeers the cellular machinery to replicate viral particles. Over time, the relentless destruction of CD4+ cells outpaces the body's ability to produce them, leading to a progressive decline in cellular immunity. This depletion leaves the host vulnerable to various opportunistic infections and cancers that a healthy immune system would normally control.
As cellular immunity deteriorates, patients become susceptible to pathogens that rarely cause severe disease in immunocompetent individuals. Pneumocystis jirovecii pneumonia presents with progressive dyspnea and a dry cough. Oral candidiasis and esophageal thrush cause painful swallowing and poor nutritional intake. Central nervous system involvement can manifest as toxoplasmosis, causing focal neurological deficits. Additionally, advanced immunosuppression sparks malignancies like Kaposi sarcoma, visible as purplish skin lesions, and aggressive non-Hodgkin lymphomas.
Accurate identification of HIV relies on a tiered testing strategy. Fourth-generation combination immunoassays detect both HIV antibodies and the p24 antigen, shortening the diagnostic window period considerably. Rapid diagnostic tests using capillary blood provide quick results in resource-limited settings but require confirmation. Positive screening results must always be verified using a secondary differentiating assay, such as an antibody differentiation immunoassay or a viral load test, to eliminate false positives and confirm active viremia before initiating lifelong antiretroviral therapy.
Ongoing evaluation of an HIV-positive patient centers around two key laboratory markers: the CD4+ T-cell count and the plasma viral load. The CD4 count measures the health and functional capacity of the immune system, guiding decisions on when to start prophylactic medications against opportunistic infections. The viral load measures the amount of viral RNA per milliliter of blood, reflecting how actively the virus is replicating. Achieving and maintaining an undetectable viral load is the primary goal of treatment, which preserves immune function and prevents transmission.
Comprehensive nursing assessment for individuals living with HIV involves a thorough history focusing on systemic symptoms, nutritional status, and medication adherence. Nurses screen routinely for persistent fevers, unexplained weight loss, chronic diarrhea, and neurological changes that signal disease progression or treatment failure. Assessment also requires evaluating psychosocial well-being, as stigma, depression, and anxiety frequently interfere with consistent therapeutic engagement. Documenting baseline symptoms helps track response to antiretroviral therapy and informs timely multidisciplinary interventions.