Diseases notes - Pathogens

  • Created by: Abc12345
  • Created on: 28-11-14 17:50


  • A pathogen is a disease inducing organism
  • The host is the infected organism
  • A disease is an abnormal condition of an organism which impares bodily functions
  • Pathogens include: 


  • Bacteria are simple, prokaryotic cells
  • They contain no nucleus
  • Not all of them are pathogenic
  • They can tolerate a lot of conditions and multiply rapidly
  • Many release toxins

Cholera is an example of a bacterium in the syllabus. They release toxins which affect the digestive system causing severe diarrhoea. Tuberculosis is another example of a bacterium, it affects the lungs. 


  • Not strictly cells
  • They are particles compromising of a protein coat containing genetic material and enzymes
  • They are all  pathogenic
  • They live as an obligate parasite, by invading host cells to reproduce

Influenza is a virus which affects the lungs and trachea. The host's immune system then releases chemicals which cause fever, muscle aches and fatigue. 


  • Fungi are the most complex eukaryotic cells
  • Have a nucleus and other membrane bound…


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