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Infection Cycle

Carina Melinger

CMA p. 0-1

Reservoir Host

Reservoir Host

The one who becomes infected by the pathogen

  • Source of transfer of the pathogen
  • Provides nourishment for growth and multiplication of the pathogen

Means of Exit

Means of Exit

  • intestinal tract
  • urinary tract
  • reporoducive tract
  • open wounds

  • mouth
  • nose
  • throat
  • ears
  • eyes

Means of Transmission

Means of Transmission

  • direct contact with infected person or discharge
  • indirect transfer by droplet infection: droplets of moisture expelled from the upper respiratory tract
  • coughing
  • sneezing
  • insects
  • contaminated hand equipment
  • contaminated food and water

Means of Entry

Means of Entry

  • intestinal tract
  • reproductive tract
  • open wounds
  • breaks in the skin
  • mucous membranes
  • mouth
  • nose
  • throat
  • ears
  • eyes

Susceptible Host

Susceptible Host

One who is capable of being infected by the pathogen.

  • low resistance increases susceptibility
  • poor health
  • poor hygiene
  • poor nutrition
  • stress
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