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Streptococcus pyogenes pneumonia with abscess formation.

H D McIntyre1, J G Armstrong, C A Mitchell

  • 1Princess Alexandra Hospital, Woolloongabba, Qld, Australia.

Australian and New Zealand Journal of Medicine
|June 1, 1989
PubMed
Summary
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Streptococcus pyogenes pneumonia can rapidly cause lung abscesses and cavitation, even with antibiotic treatment. Prolonged penicillin therapy led to satisfactory radiological resolution in a challenging case.

Area of Science:

  • Infectious Diseases
  • Pulmonology
  • Microbiology

Background:

  • Pneumonia caused by Streptococcus pyogenes (S. pyogenes) is uncommon in adults.
  • This case highlights a severe presentation of S. pyogenes pneumonia in an immunocompetent adult.

Observation:

  • A 30-year-old female with mild asthma presented with severe symptoms including high fever, hypotension, pleuritic chest pain, vomiting, and diarrhea.
  • Chest radiography revealed right upper lobe consolidation, with S. pyogenes identified in blood and sputum cultures.
  • Despite initial antibiotic treatment and recovery, the patient relapsed with rapid development of a large lung abscess cavity.

Findings:

  • S. pyogenes pneumonia can occur without preceding viral illness or significant predisposing factors.
  • Rapid cavitation can develop despite appropriate antibiotic therapy.

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  • Intravenous penicillin followed by prolonged oral therapy resulted in clinical improvement and progressive radiological resolution.

    • Implications:

    • This case underscores the potential for S. pyogenes to cause severe, rapidly progressing pneumonia and lung abscesses in adults.
    • Prompt and prolonged penicillin therapy is crucial for managing S. pyogenes pneumonia with cavitation.
    • Further research into the pathogenesis and optimal treatment strategies for S. pyogenes pneumonia is warranted.