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{{review}}
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===Introduction===
 
===Introduction===
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*[[Parasites]]- comprising [[protozoa]] and [[helminths]]
 
*[[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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<br />
 
All exist as either:
 
All exist as either:
 
*Primary pathogens ('''obligate'''): presence always corresponds with disease
 
*Primary pathogens ('''obligate'''): presence always corresponds with disease
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*'''Orofecal''':typically enteric infections
 
*'''Orofecal''':typically enteric infections
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==[[Host Invasion by Microorganisms Flashcards|Host Invasion Flashcards]]==
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{{Learning
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|flashcards = [[Host Invasion by Microorganisms Flashcards|Host Invasion Flashcards]]
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}}
    
===References===
 
===References===
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*http://www.cellsalive.com
 
*http://www.cellsalive.com
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{{review}}
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<br><br>
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{{Jim Bee 2007}}
 
[[Category:Immunology]]
 
[[Category:Immunology]]
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