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1. introduction

   • pathogen- microorganism capable of causing a disease.
   • conventional-microorganism that cause infection in healthy individuals in the absence of specific immunity
   • opportunistic- microorganisms that cause infection when the hosts resistance/immunity is compromised.
   • antigen- molecule that causes an immune response in the host
   • characteristics of a good pathogen:-ability to attach to host.-invasiveness.-production of toxins .-antigenic variation(to escape host defenses)
   • virulence- harmful quality possessed by microorganism.
     • disease- harmful alteration of host tissues
     • incubation period- time between infection and signs of symptoms
     • pathogenicity - harm to the host
     • asymptomatic- showing no symptoms
   • prokaryotic- cells lack a nucleus and membrane bound organelles
     • eukaryotic- cells posses a nucleus and membrane bound organelles

2. koches postulates

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