Difference between revisions of "Category:Streptococcus species"
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| − | {{ | + | {{frontpage |
| + | |pagetitle =Streptococcus species | ||
| + | |pagebody = | ||
| + | |contenttitle =Content | ||
| + | |contentbody =<big><b> | ||
| + | <categorytree mode=pages>Streptococcus species</categorytree> | ||
| + | </b></big> | ||
| + | |logo =bugs-logo copy.png | ||
| + | }} | ||
===Overview=== | ===Overview=== | ||
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*Haemolytic streptococci of Lancefield group C are common inhabitants of the equine nasopharynx | *Haemolytic streptococci of Lancefield group C are common inhabitants of the equine nasopharynx | ||
*''Streptococcus zooepidemicus'' and ''S. equisimilis'' are usually non-pathogenic | *''Streptococcus zooepidemicus'' and ''S. equisimilis'' are usually non-pathogenic | ||
| − | *Involved in [[ | + | *Involved in [[Peritonitis#In pigs|peritonitis in pigs]], [[Pyothorax|pyothorax]], [[Osteomyelitis|osteomyelitis]], [[Stomatitis|catarrhal stomatitis]] |
| − | *In infectious [[ | + | *In infectious [[Infectious Arthritis#In Sheep|arthritis of sheep]], [[Infectious Arthritis#In Cattle|arthritis in calves]], [[Infectious Arthritis#In Horses|arthritis in horses]] and [[Infectious Arthritis#In Pigs|arthritis in pigs]] |
*Often commensals on mucous membranes of upper respiratory and lower urogenital tract | *Often commensals on mucous membranes of upper respiratory and lower urogenital tract | ||
*Opportunistic infections | *Opportunistic infections | ||
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| − | === | + | ===Pathogenesis and Pathogenicity=== |
*Beta-haemolytic strains more pathogenic than alpha-haemolytic strains | *Beta-haemolytic strains more pathogenic than alpha-haemolytic strains | ||
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| − | + | '''in sheep''' | |
| + | *[[:Category:Streptococcus species|'''''Streptococcus'' spp.''']] | ||
| + | **Commonly cause suppurative polyarthritis in lambs | ||
| + | **Naval infection -> bacteriamia -> polyarthritis | ||
| + | ***May also cause blindness and nervous signs if uvea or meninges are affected | ||
| + | **Larger joints are more afected | ||
| + | ***May spread to other organs | ||
| − | + | '''in cattle''' | |
| − | + | *Neonatal polyarthritis by: | |
| + | ***Via umbilicus | ||
| + | ***Also involves eyes and meninges | ||
| − | + | [[Category:Bacterial Organisms]] | |
| − | + | [[Category:Gram_positive_bacteria]] | |
| − | + | [[Category:Cocci]] | |
| − | + | [[Category:To_Do_-_Bacteria]] | |
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Latest revision as of 16:33, 3 March 2011
Streptococcus species
Overview
- Cause suppurative infections in many different animals
- Cause abscess formation and septicaemia
- Cause mastitis, metritis, polyarthritis, meningitis
- Primary or secondary infections following viral infection
- Neonatal septicaemia related to maternal genital tract infection
- Haemolytic streptococci of Lancefield group C are common inhabitants of the equine nasopharynx
- Streptococcus zooepidemicus and S. equisimilis are usually non-pathogenic
- Involved in peritonitis in pigs, pyothorax, osteomyelitis, catarrhal stomatitis
- In infectious arthritis of sheep, arthritis in calves, arthritis in horses and arthritis in pigs
- Often commensals on mucous membranes of upper respiratory and lower urogenital tract
- Opportunistic infections
Characteristics
- Gram positive cocci forming chains
- Catalase negative, facultative anaerobes
- Fastitidious - require enriched media such as blood or serum
- Small haemolytic, translucent colonies, some mucoid
- Catalase negative
- Susceptible to desiccation
Identification
- Beta haemolysis (complete with clear zones surrounding colonies)
- Alpha haemolysis (partial with green zones surrounding colonies)
- Lancefield grouping - serology based on group-specific polysaccharide in cell wall
- Biochemical testing
Diagnosis
- Swabs of pus or exudate cultured on blood agar and MacConkey agar
- No growth on MacConkey except S. faecalis
- PCR, Lancefield grouping and biochemical tests
Pathogenesis and Pathogenicity
- Beta-haemolytic strains more pathogenic than alpha-haemolytic strains
- Virulence factors include streptolysins, hyaluronidase, DNase, streptokinase and proteases
- S. pyogenes, S. pneumoniae and some strains of S. equi have polysaccharide capsules which are antiphagocytic
- S. pyogenes and S. equi have antiphagocytic cell wall M proteins
in sheep
- Streptococcus spp.
- Commonly cause suppurative polyarthritis in lambs
- Naval infection -> bacteriamia -> polyarthritis
- May also cause blindness and nervous signs if uvea or meninges are affected
- Larger joints are more afected
- May spread to other organs
in cattle
- Neonatal polyarthritis by:
- Via umbilicus
- Also involves eyes and meninges
Pages in category "Streptococcus species"
The following 10 pages are in this category, out of 10 total.