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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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Microorganisms are categorised into distinct types. The main categories of veterinary interest are bacteria, fungi, protozoa, viruses and prions, although a wide array of other microorganisms also exist such as algae.

Microorganisms are categorised into distinct types. The main categories of veterinary interest are bacteria, fungi, protozoa, viruses and prions, although a wide array of other microorganisms also exist such as algae.

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==[[Bacteria - Overview]]==

==[[Bacteria - Overview]]==