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13 Cards in this Set
- Front
- Back
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live microorganisms which when administered in adequate amounts confer a health benefit on the host
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Probiotic
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any disease-producing biological agent
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Pathogens
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in absence of normal host resistance
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Opportunistic Pathogen
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the ability to produce harmful pathologic changes
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Pathogenicity
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quantitative measure of pathogenicity
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Virulence
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growth of microbes inside host tissues (may or may not harm)
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Infection
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damage or injury to host in which host function is impaired
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Disease
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mixture of microbes normally found at any anatomical site in healthy organism
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Normal Flora
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Most common site for colonization of microbes?
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-muccous membranes (mouth, respiratory, urinary and gastrointestinal tracts)
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Muccous membranes are:
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-Lined with layer(s) of epithelial cells
-Coated with layer of mucus |
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Certain bacteria colonize only certain cells
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Tissue Tropism
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on bacterial cell surface to recognize and bind host cell surface receptors
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Adhesins
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-Born in sterile environment (germ-free)
-Can establish germ-free animal colonies -Allow investigation of interactions with specific microorganisms deliberately introduced into the animal -Examples: mice, pigs, chickens -Microbiologically monitored to confirm |
Gnotobiotic Animals
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