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==Introduction==

==Introduction==

Infectious agents are microorganisms found in nature that are harmful to animals and plants. Most microorganisms found in nature are not harmful, however some microorganisms can cause disease and are therefore referred to as pathogenic.

Infectious agents are microorganisms found in nature that are harmful to animals and plants. Most microorganisms found in nature are not harmful, however some microorganisms can cause disease and are therefore referred to as pathogenic.

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==[[Bacteria - Overview]]==

==[[Bacteria]]==

Bacteria are unicellular prokaryotes, usually with rigid cell walls. They are much smaller than eukaryotic cells, although they can

Bacteria are unicellular prokaryotes, usually with rigid cell walls. They are much smaller than eukaryotic cells, although they can

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==[[Fungi - Overview]]==

==[[Fungi]]==

Fungi are non-photosynthesising eukaryotes including

Fungi are non-photosynthesising eukaryotes including

to secrete mycotoxins that are able to cause disease.  

to secrete mycotoxins that are able to cause disease.  

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==[[Viruses - Overview]]==

 

==[[Viruses]]==

The most notable difference between bacteria, fungi and

The most notable difference between bacteria, fungi and

viruses is that viruses are not cells. Viruses consist of nucleic acid, either

viruses is that viruses are not cells. Viruses consist of nucleic acid, either