Streptococcus pyogenes

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''Streptococcus pyogenes'' is a spherical [[Gram-positive|Gram-positive]] bacterium around 0.6-1.0 µm in diameter, which is enclosed in a capsule and exists in pairs or in chains. It is a non-motile, facultative organism where its metabolism allows it to grow in the presence and absence of [[Oxygen|oxygen]].&nbsp; ''Pyogenic streptococci'' are beta-haemolytic and so subsequently cause complete lysis of [[Red blood cells|red blood cells]] in [[Blood agar|blood agar]], making them clear and colourless. They produce a large number of enzymes and toxins which contribute to the invasion and pathogenesis of infections that ''Streptococcus pyogenes'' causes <ref>Folds, J. D. and Normansell, D. E. (1999) Pocket Guide to Clinic Immunology. Washington, D.C.: American Society for Microbiology</ref>&nbsp;<ref>Sleigh, J. D. and Timbury, M. C. (1998) Notes on Medical Bacteriology. 5th ed. New York: Churchill Livingstone.</ref>.<br>  
 
''Streptococcus pyogenes'' is a spherical [[Gram-positive|Gram-positive]] bacterium around 0.6-1.0 µm in diameter, which is enclosed in a capsule and exists in pairs or in chains. It is a non-motile, facultative organism where its metabolism allows it to grow in the presence and absence of [[Oxygen|oxygen]].&nbsp; ''Pyogenic streptococci'' are beta-haemolytic and so subsequently cause complete lysis of [[Red blood cells|red blood cells]] in [[Blood agar|blood agar]], making them clear and colourless. They produce a large number of enzymes and toxins which contribute to the invasion and pathogenesis of infections that ''Streptococcus pyogenes'' causes <ref>Folds, J. D. and Normansell, D. E. (1999) Pocket Guide to Clinic Immunology. Washington, D.C.: American Society for Microbiology</ref>&nbsp;<ref>Sleigh, J. D. and Timbury, M. C. (1998) Notes on Medical Bacteriology. 5th ed. New York: Churchill Livingstone.</ref>.<br>  
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They are most commonly found in the oral cavity and from the throat they are able to spread infection elsewhere.
  
 
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Revision as of 13:15, 26 October 2012

Streptococcus pyogenes is a spherical Gram-positive bacterium around 0.6-1.0 µm in diameter, which is enclosed in a capsule and exists in pairs or in chains. It is a non-motile, facultative organism where its metabolism allows it to grow in the presence and absence of oxygenPyogenic streptococci are beta-haemolytic and so subsequently cause complete lysis of red blood cells in blood agar, making them clear and colourless. They produce a large number of enzymes and toxins which contribute to the invasion and pathogenesis of infections that Streptococcus pyogenes causes [1] [2].

They are most commonly found in the oral cavity and from the throat they are able to spread infection elsewhere.

References:

  1. Folds, J. D. and Normansell, D. E. (1999) Pocket Guide to Clinic Immunology. Washington, D.C.: American Society for Microbiology
  2. Sleigh, J. D. and Timbury, M. C. (1998) Notes on Medical Bacteriology. 5th ed. New York: Churchill Livingstone.

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