Ecology of the pathogen and modes of transmission

on 3.9.08 with 0 comments



  • some pathogens are ubiquitous in the environment; others have specific niches

  • some are vector-borne (e.g. via insects)

  • zoonotic: animal reservoirs

  • person-to-person: some grow only in humans and have no other niche

  • some are part of normal flora


typical steps during microbial pathogenesis

  • colonization or attachment

  • invasion

  • evasion of host defenses, a virulence mechanism

  • host damage


colonization

  • often a prelude to pathogenesis, but doesn’t always lead to disease. for example

  • 20-40% carry Streptococcus pneumoniae

  • 5-10% carry Neisseria meningiditis

Category: Microbiology Notes

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