Difference between revisions of "Host invasion by microorganisms"
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*[[Parasites]]- comprising [[protozoa]] and [[helminths]] | *[[Parasites]]- comprising [[protozoa]] and [[helminths]] | ||
| − | A fifth controversial type | + | A fifth, controversial, type, Pirons, are infectious proteins that are believed to be the cause of bovine spongiform encephalopathy (BSE) and the human variant Creutzfeldt–Jakob disease (vCJD). |
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All exist as either: | All exist as either: | ||
*Primary pathogens ('''obligate'''): presence always corresponds with disease | *Primary pathogens ('''obligate'''): presence always corresponds with disease | ||
Revision as of 10:49, 4 May 2012
Introduction
One of the main causes of disease is infection by microorganisms, with four types so far identified:
A fifth, controversial, type, Pirons, are infectious proteins that are believed to be the cause of bovine spongiform encephalopathy (BSE) and the human variant Creutzfeldt–Jakob disease (vCJD).
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
| Host invasion by microorganisms Learning Resources | |
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 Test your knowledge using flashcard type questions |
Host Invasion Flashcards |
References
- Murphy, K., Travers, P. and Walport, M. (2008) Janeway's Immunobiology. 7th ed. New York: Garland Science Publishing.
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This article has been peer reviewed but is awaiting expert review. If you would like to help with this, please see more information about expert reviewing. |
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Originally funded by the RVC Jim Bee Award 2007 |