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INFECTION PATHOGENICITY - BIOL 351 Fall 2011 Infection and...

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BIOL 351 Fall 2011 Infection and Pathogenesis SQ Part 1 1) Be able to define the following terms: infectious disease, pathogen, and virulence. Infection= when a parasite is growing and multiplying within the host; varies with respect to severity, location, and # of organisms Infectious disease= change form a state of health in which part of all of the host body is not capable of carrying on its normal functions due to the presence of a parasite or its products Pathogen= organism or agent that produces a disease 2) Explain the difference between a pathogen and an opportunistic pathogen. (Note: the definition on page 740 of the textbook is incomplete; please look at the definition on page 739 or in the glossary.) Opportunistic pathogens are microorganisms that are free living or part of the host’s normal microbiota but may become pathogenic under certain circumstances such as when the immune system is compromised; pathogen is any microorganism or agent that causes a disease. 3) What factors determine the outcome of most host-parasite relationships? Number of microorganisms Virulence=degree or intensity of pathogenicity Host’s defenses or degree of resistance 3) Define source, reservoir, and carrier. How are they related?
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