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  • Infection
    • Microorganisms: Any organism too small to be seen by the naked eye.
      • Pathogen: Microorganisms that cause disease.
        • Exogeneous Pyrogens: Delivered from the outside host
        • Endogenous Pyrogens: Produced by individual
      • Classes of Infectious Microorganisms
        • Bacterial Infection
        • Viral Infection
        • Fungal Infection
        • Parasitic & Protozoal infection
    • Relationship with humans
      • Symbiosis: Benefits humans & does not harm the microorganism
      • Mutualism: Benefits humans & microorganism
      • Commensalism: Benefits microorganism & not harm the human
      • Pathogenicity: Benefits microorganism & harms the human
      • Opportunism: A benign microorganism becomes pathogenic because of decreased human host resistance
    • Process of infection Colonization Invasion        Multiplication Spread
    • Clinical Infection Disease Process
      • 1. Incubation Period: Interval between exposure to infection agent & appearance of first symptoms
        • 2. Prodromal Stage: Appearance of initial symptoms which are often mild including feeling of discomfort & tiredness
          • 3.Invasion Period: Pathogen multiplying rapidly, invading further, affecting tissues at site of initial colonization & other areas
            • 4. Convalescence Period: Individuals immune & inflammatory systems have in general successfully removed infectious agents.
    • Bacteria Shapes: Spherical, Rodlike & spiral
      • Bacteriemia: Bacteria being transported in the blood due to failure of body's defence mechanisms to infect other organs or multiplying in the blood (Sepsis)


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