Microbiology Exam #3 Vocabulary

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relationship between host and parasite, ensuing struggle for supremacy

normal flora

infection that does not cause disease


ability of a parasite to enter host tissue and/or cells


parasitic organism that has ability to cause disease


organism that is usually a commense


degree of pathogenicity


contaminated inanimate objects


presence of bacteria in bloodstream


bacterium in bloodstream is the cause of the disease

portal of entry

site at which pathogenic organism enters host

infectious dose

number of pathogens that must enter host to establish disease


ability of a pathogen to penetrate tissues of the host

virulence factors

substances or structures that allow a pathogen to generate disease in the host


movement along a chemical gradient

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