Erysipelas laboratory findings: Difference between revisions
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===Culture=== | ===Culture=== | ||
* | *An [[epidermal]] swab of affected region may provide samples of pathogenic [[streptococci]], including ''[[Streptococcus pyogenes]]''<ref name="pmid26866211">{{cite journal |vauthors=Ferretti JJ, Stevens DL, Fischetti VA, Stevens DL, Bryant AE |title= |journal= |volume= |issue= |pages= |year= |pmid=26866211 |doi= |url=}}</ref> | ||
**[[Streptococci]] will usually be grown on agar media to produce β-[[hemolysis]] for subsequent identification and specification. | **[[Streptococci]] will usually be grown on agar media to produce β-[[hemolysis]] for subsequent identification and specification. | ||
**''[[Streptococcus pyogenes]] will display as smooth, white-grey domes surrounded by β-[[hemolysis]]. | **''[[Streptococcus pyogenes]] will display as smooth, white-grey domes surrounded by β-[[hemolysis]]. | ||
***They will be arranged in chain formation as [[Gram-positive]] [[cocci]] when examined microscopically. | ***They will be arranged in chain formation as [[Gram-positive]] [[cocci]] when examined microscopically. | ||
**[[Catalase]] testing will confirm that the isolates obtained through the culture swab represent [[streptococci]] infection. | |||
===Streptococcal Identification Tests=== | ===Streptococcal Identification Tests=== | ||
* | *Erysipelas laboratory findings include identification tests to determine the exact species of [[streptococcal]] infection. | ||
**The [[Lancefield]] [[antigen]] test will determine the specific [[antibodies]] produced by the β-[[hemolytic]] [[streptococcal]] infection, allowing classification into group A, B, C, or G ''[[streptococcus]]''. | |||
**The Pyrrolidonyl Arylamidase (PYR) test is used to determine if the infection is ''[[Streptococcus pyogenes]]'' by testing for confirmed presence of pyrrolidonyl [[aminopeptidase]] | |||
** | |||
==References== | ==References== | ||
Revision as of 15:39, 14 September 2016
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Luke Rusowicz-Orazem, B.S.
Overview
Laboratory Findings
Laboratory tests and findings for Erysipelas include those used to confirm streptococcal infection for pathogenic strains.
Culture
- An epidermal swab of affected region may provide samples of pathogenic streptococci, including Streptococcus pyogenes[1]
- Streptococci will usually be grown on agar media to produce β-hemolysis for subsequent identification and specification.
- Streptococcus pyogenes will display as smooth, white-grey domes surrounded by β-hemolysis.
- They will be arranged in chain formation as Gram-positive cocci when examined microscopically.
- Catalase testing will confirm that the isolates obtained through the culture swab represent streptococci infection.
Streptococcal Identification Tests
- Erysipelas laboratory findings include identification tests to determine the exact species of streptococcal infection.
- The Lancefield antigen test will determine the specific antibodies produced by the β-hemolytic streptococcal infection, allowing classification into group A, B, C, or G streptococcus.
- The Pyrrolidonyl Arylamidase (PYR) test is used to determine if the infection is Streptococcus pyogenes by testing for confirmed presence of pyrrolidonyl aminopeptidase