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26 Cards in this Set
- Front
- Back
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infectious disease process in an animal
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entry, replication, spread from entry site, evasion of host defenses, damage to cells, tissues and organs, exit
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persistent infection
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when clinical disease may not be apparent, but the animal still sheds pathogen, exposing others
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Damage to cells tissues and organs
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may be caused by pathogen itself or by animal's own defense mechanism
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colonization
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presence of an infectious agent in or on an individual
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infection
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presence of an infectious again with damage to host cells, tissues, or organs. may or may not have clinical symptoms
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infectious disease
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a clinical state in which infection results in detectable physiologic abnormalities
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syndrome
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set of clnical signs which occur together, the sum of clinical signs in a disease state
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parasite
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organism living in permanent association with and at the expense of its host
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host
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animal carrying a parasite
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saprophyte
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organism that usually inhabit the inanimate environment (e.g. soil)
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commensal
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parasite that causes no discernible harm to its host
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pathogen
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any infectious agent that can induce pathology (or disease); may be a parastie or a saprophyte
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pathogenicity
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refers to the capacity of an infectious agent to induce pathology
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virulence
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refers to the severity of disease induced by a pathogen, and is often used as a synonym for pathogenicity
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virulent
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marked by a rapid, sever, and destructive course; able to overcome bodily defensive mechanisms: markedly pathogenic
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avirulent
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not virulent, not pathogenic
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attenuate
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reduced in virulence, less virulent
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extracellular parasite, extracellular pathogen
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infectious agent that replicates outside host cells
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intracellular parasite, intracellular pathogen
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infectious agen that replicates inside host cells
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obligate intracellular parasite
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can only replicate inside host cells
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facultative intracellular parasite
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may replicate inside or outside host cell
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Outcomes of infection
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disease
no disease |
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Outcomes of infection causing disease
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recovery
persistent infection death |
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Viruses
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obligate intracellular
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bacteria
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extracellular
facultative intracellular obligate intracellular |
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fungi
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extracellular
facultative intracellular |
