POPM 3240 Lecture Notes - Lecture 4: Adaptive Immune System, Innate Immune System, Herd Immunity

• School: University of Guelph
• Department: Population Medicine
• Course: POPM 3240
• Professor: Andrea Jones- Bitton

Document Summary

Any living carrier that transports an infectious agent from an infected individual (or its wastes) to a susceptible individual, or its food, or immediate surroundings. E. g. ticks and lyme disease (tick will regurgitate some gut content into the host. Disease in nature that are shared by vertebrate animals and humans. Infected is the host invaded by microorganisms multiply, and the response of the host immune system. Diseased is the infection causing clinical signs (can see or measure) and symptoms (only the patient can experience) Infected with infectious agent but clinically normal and can transmit the agent. More difficult to detect than a clinically diseased individual. Agent colonized in the host but immune system does not respond. Susceptibility pre-symptomatic disease clinical disease disability or recovery. From exposure to being detectable (picked up by tests) The communicability period can be prior to onset and after recovery.