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6 Cards in this Set

  • Front
  • Back
What is pathogenicity?
Ability of an organism to infect a susceptible host genotype and cause disease
What is virulence?
The degree of disease caused by a pathogen genotype under appropriate conditions. Akin to aggressiveness.
What makes a pathogen "Community acquired?"
bacteria were acquired outside of the hospital setting
What are Nosocomial pathogens?
Hospital acquired microbes
What are Koch’s Postulates?
FIRST, isolate the suspected agent from a disease victim.
SECOND, grow the agent in pure culture.
THIRD, infect a healthy host and show that the organism produces the CLASSICAL CLINICAL DISEASE.
FOURTH, ISOLATE the "same" organism from the new victim.
What are two exceptions to Koch’s Postulates?
Postulates imply virulence is all due to bacteria
- host susceptibility is at least as important

Postulates emphasize the ability to get a pure culture
- some pathogens cannot be cultured.