Passive immunity - Introduction of antibodies from an outside source, Active immunity - Own immune system stimulates antibodies to be created, Anti-venom - Example of passive immunity, Artificial active immunity - Vaccination, Vaccination - Introduction of appropriate disease antigens into the body to stimulate an immune response, Herd immunity - When a sufficiently large proportion of the population has been vaccinated to make it difficult for pathogens to spread, Antigenic variability - When the pathogen mutates quickly and the antigens change., HIV - Human immunodificiency virus, AIDS - Acquired immune deficiency syndrome, CD4 - The protein on the surface of cells that HIV binds to (mainly T helper cells), Reverse transcriptase - Converts RNA to DNA. HIV uses this enzyme, ELISA - Enzyme Linked Immunosorbent Assay, Antibiotics - Inhibit enzymes involved in production of cell wall, which causes cell lysis,

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