Erysipelas laboratory findings
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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