Process of invasion

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  • Process of Infection
    • 1.Colonisation
      • infectious microorganisms exist in reservoirs nfectious microorganisms exist in reservoirs
    • 2. Invasion
      • Infectious agent can invade surrounding tissues/other sites? Developed mechanisms to penetrate tissues & avoid host’s nonspecific and specific defences (inflammation & immunity)
    • 3. Multiplication
      • Warm, nutrient filled host environment? Undergo rapid multiplication – replicate within infected cells (viral pathogens); replicate in macrophages & other cells (bacterial pathogens)
    • 4. Spread
      • Produce localized infections without spread to other regions of the body. Relies on virulence factors- adhesions molecules and protection against hosts inflammatory and immune system  inflammatory and immune system

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