Erysipelas laboratory findings: Difference between revisions
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**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 [[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]] | **The Pyrrolidonyl Arylamidase (PYR) test is used to determine if the infection is ''[[Streptococcus pyogenes]]'' by testing for confirmed presence of pyrrolidonyl [[aminopeptidase]] | ||
** | **[[Bacitracin]] susceptibility testing is used as a next subsequent measure of specifying the [[streptococcal]] strain when PYR test results are positive, separating ''[[Streptococcal pyogenes]]'' from other β-[[hemolytic]] strains. | ||
***Results of [[bacitracin]] sensitivity indicate positive ''[[Streptococcal pyogenes]]'' test results.<ref name="urlwww.cdc.gov">{{cite web |url=https://www.cdc.gov/streplab/downloads/general-methods-sections1-2.pdf |title=www.cdc.gov |format= |work= |accessdate=}}</ref> | |||
==References== | ==References== | ||
Revision as of 15:57, 14 September 2016
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Erysipelas Microchapters |
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Diagnosis |
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Treatment |
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Case Studies |
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Erysipelas laboratory findings On the Web |
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American Roentgen Ray Society Images of Erysipelas laboratory findings |
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Risk calculators and risk factors for Erysipelas laboratory findings |
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
- Bacitracin susceptibility testing is used as a next subsequent measure of specifying the streptococcal strain when PYR test results are positive, separating Streptococcal pyogenes from other β-hemolytic strains.
- Results of bacitracin sensitivity indicate positive Streptococcal pyogenes test results.[2]