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# LECTURE #30: IMMUNE SPECIFIC IMMUNITY **Innate vs. Adaptive (Specific)** **Adaptive (Specific) Immunity:** Acquired after birth 1. **Active Immunity:** Develops after exposure to an antigen. Lasts longer, potentially lifelong. * **Naturally acquired active immunity:** Via environmental exp...

# LECTURE #30: IMMUNE SPECIFIC IMMUNITY **Innate vs. Adaptive (Specific)** **Adaptive (Specific) Immunity:** Acquired after birth 1. **Active Immunity:** Develops after exposure to an antigen. Lasts longer, potentially lifelong. * **Naturally acquired active immunity:** Via environmental exposure to pathogens. * Example: Exposure to chicken pox * **Artificially acquired active immunity** Via vaccines * Example: Vaccines for measles. 2. **Passive Immunity:** Produced by transferring antibodies from another source. Short-lived. * **Naturally acquired passive immunity:** Antibodies acquired via mother. * Example: Breast milk * **Artificially acquired passive immunity** Via injection of antibodies * Example: Anti-serum for snake venom **Adaptive Defenses:** Result from coordinated activities of T cells & B cells **Cell-mediated Immunity (Cellular Immunity):** 1. Phagocytes encounter antigen on cells. Activates T cells. 2. T cells directly attack abnormal cells + pathogens & stimulate activity of B cells **Antibody-mediated Immunity (Humoral Response):** 1. Activated B cells differentiate into plasma cells and produce antibodies. 2. Plasma cells defend against antigens + pathogens in body fluids. **Immunocompetence:** The ability to produce an immune response after exposure to an antigen.