Immunology of HIV Infection

This topic provides a comprehensive overview of the immune system's interaction with HIV, essential for tertiary-level students in Zambia studying medicine, immunology, or medical laboratory science. It covers the components of the immune system, including innate and adaptive immunity, with a specific focus on the roles of CD4+ (helper) and CD8+ (cytotoxic) T-lymphocytes. The module explains how HIV selectively targets and depletes CD4+ cells, leading to progressive immunodeficiency. Key concepts include the immune response during primary infection, the establishment of viral reservoirs in sanctuary sites, and the differences in disease progression between adults and children. Understanding these immunological principles is crucial for interpreting CD4 counts, viral load results, and the clinical staging of HIV. For Zambian college and university students, this topic bridges basic science and clinical application, preparing them for examinations and for managing HIV as future healthcare professionals. It emphasizes the immunological basis for opportunistic infections and the rationale behind immune-based monitoring in Zambia's national HIV care guidelines.