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| − | ===Introduction===
| + | <big>Back to [[Immunology - WikiBlood|Immunology]]</big> |
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| − | One of the main causes of disease is infection by microorganisms, with four types so far identified:
| + | ===[[Viruses - WikiBlood|Viruses]]=== |
| − | *[[Viruses]]
| + | ===[[Bacteria - WikiBlood|Bacteria]]=== |
| − | *[[Bacteria]]
| + | ===[[Parasites - WikiBlood|Parasites]]=== |
| − | *[[Fungi]]
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| − | *[[Parasites]]- comprising [[protozoa]] and [[helminths]]
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| − | A fifth controversial type are Pirons, which are infectious proteins that are believed to be the cause of bovine spongiform encephalopathy (BSE) and the human variant Creutzfeldt–Jakob disease (vCJD).<br />
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| − | All exist as either:
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| − | *Primary pathogens ('''obligate'''): presence always corresponds with disease
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| − | *Secondary ('''opportunistic'''): prerequisites must be fulfilled before disease occurs
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| − | Microorganisms can enter the body by three routes:
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| − | *'''Contact''': typically seen in dermatological infections
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| − | *'''Aerosol''': typically respiratory infections
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| − | *'''Orofecal''':typically enteric infections
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| − | {{Learning
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| − | |flashcards = [[Host Invasion by Microorganisms Flashcards|Host Invasion Flashcards]] | |
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| − | ===References===
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| − | *<div id="Janeway">{{citation|initiallast = Murphy|initialfirst = K|2last = Travers|2first = P|finallast = Walport|finalfirst = M|year = 2008|title = Janeway's Immunobiology|ed = 7th |city = New York|pub = Garland Science Publishing}}</div>
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| − | *http://www.cellsalive.com
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| − | {{review}}
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| − | <br><br>
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| − | {{Jim Bee 2007}}
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| − | [[Category:Immunology]]
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