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Related Experiment Videos

Occult Streptococcus pyogenes in cellulitis: demonstration by immunofluorescence

W B Shelley1, N Talanin, E D Shelley

  • 1Department of Medicine, Medical College of Ohio, Toledo 43699-0008, USA.

The British Journal of Dermatology
|June 1, 1995
PubMed
Summary

This study identifies Streptococcus pyogenes as the cause of cellulitis in a young man, even when initial tests were negative. Prompt treatment with cefazoline led to resolution of the infection.

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Area of Science:

  • Infectious Diseases
  • Microbiology
  • Dermatology

Background:

  • Cellulitis is a common bacterial skin infection.
  • Ascending lymphangitis indicates pathogen spread.
  • Standard diagnostic methods can sometimes yield negative results.

Observation:

  • A 23-year-old male presented with cellulitis and lymphangitis of the right leg.
  • Blood cultures and skin aspirates were sterile.
  • Gram stain of aspirate showed no bacteria.

Findings:

  • Direct and indirect immunofluorescence staining identified Streptococcus pyogenes in the reticular dermis.
  • The pathogen was confirmed despite negative initial cultures and Gram stain.
  • Intravenous cefazoline treatment resulted in the resolution of cellulitis.

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Implications:

  • Immunofluorescence is a valuable tool for diagnosing infections when standard methods fail.
  • Early identification of Streptococcus pyogenes is crucial for effective cellulitis management.
  • This case highlights the importance of considering specific pathogens even with non-diagnostic initial tests.