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Chapter Objectives
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After reading this chapter you should be able to:
  • discuss the general characteristics of parasitic symbiosis
  • discuss the concepts of pathogens, disease, infection, and infectious disease
  • describe the stages that pathogens must go through in order to cause disease
  • distinguish exotoxins from endotoxins
  • describe the modes of action of various toxins
  • describe the mechanisms used by viruses and bacteria to evade host defenses

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