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Host invasion by microorganisms (view source)
Revision as of 09:28, 24 May 2012
, 09:28, 24 May 2012→Introduction
===Introduction===
One of the main causes of disease is infection by microorganisms, with four types so far identified:
===[[Bacteria - WikiBlood|Bacteria]]===
*[[Viruses]]
===[[Parasites - WikiBlood|Parasites]]===
*[[Bacteria]]
*[[Fungi]]
*[[Parasites]]- comprising [[protozoa]] and [[helminths]]
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 />
<br />
All exist as either:
*Primary pathogens ('''obligate'''): presence always corresponds with disease
*Secondary ('''opportunistic'''): prerequisites must be fulfilled before disease occurs
Microorganisms can enter the body by three routes:
*'''Contact''': typically seen in dermatological infections
*'''Aerosol''': typically respiratory infections
*'''Orofecal''':typically enteric infections
{{Learning
|flashcards = [[Host Invasion by Microorganisms Flashcards|Host Invasion Flashcards]]
}}
===References===
*<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>
*http://www.cellsalive.com
{{review}}
<br><br>
{{Jim Bee 2007}}
[[Category:Immunology]]