Pathogens

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What are the 4 things a microorganism must do in order to be considered as a pathogen?
Gain entry to the host; colonise tissues of the host; resist defences of the host; cause damage to host tissues.
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What are some examples of pathogens?
Bacteria, viruses, fungi
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When does an infection occur?
When a pathogen gains entry to the host and colonises its tissue.
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When does disease occur?
When an infection leads to symptoms in the host.
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What is transmission?
When a pathogen is transferred from one person to another.
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What interfaces can be considered as common points of entry for pathogens?
Gas exchange system and the digestive system
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What are the bodies natural defences towards pathogens?
Mucous layer covering exchange surfaces; enzymes; stomach acid.
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How do pathogens cause disease?
By damaging host tissues and producing toxins.
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What is an interface?
A surface environment with the internal environment of the body - e.g. skin.
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Card 2

Front

What are some examples of pathogens?

Back

Bacteria, viruses, fungi

Card 3

Front

When does an infection occur?

Back

Preview of the front of card 3

Card 4

Front

When does disease occur?

Back

Preview of the front of card 4

Card 5

Front

What is transmission?

Back

Preview of the front of card 5
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