BIOLOGY UNIT 1- Section 1

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  • Created by: lottie
  • Created on: 21-04-13 21:35

1.1 -Pathogens

Microorganisms which cause disease are called pathogens

A disease suggests a malfunction of body or mind which has an adverse effect on good health.

For a micro organism to be a pathogen it must:

  • gain entry to the host
  • colonise the tissues of the host
  • resist the defences of the host
  • cause damage to the host tissues

Pathogens include bacteria, viruses and fungi.

If a pathogen gets into the host and colonises its tissue it results in an infection. Disease occurs when an infection leads to…


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