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infection

relationship between host and parasite, ensuing struggle for supremacy

normal flora

infection that does not cause disease

pathogenicity

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

pathogen

parasitic organism that has ability to cause disease

opportunist

organism that is usually a commense

virulence

degree of pathogenicity

fomite

contaminated inanimate objects

bacteremia

presence of bacteria in bloodstream

septicemia

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

invasiveness

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

chemotaxis

movement along a chemical gradient

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