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Capsular Serotyping of Streptococcus pneumoniae Using the Quellung Reaction
Published on: February 24, 2014
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Lung abscess caused by Streptococcus pneumoniae serotype 6B
Yuhei Ito1, Hirokazu Toyoshima2, Takehiro Suzuki3
1Department of Respiratory Medicine, Ise Red Cross Hospital, Ise, Japan.
Respiratory Medicine Case Reports
|March 1, 2018
Summary
Pneumococcal lung abscess is rare, with most cases caused by Streptococcus pneumoniae serotype 3. This study reports a successful recovery from lung abscess caused by S. pneumoniae serotype 6B using antibiotics.
Area of Science:
- Pulmonary Medicine
- Infectious Diseases
- Microbiology
Background:
- Lung abscess is an uncommon complication of Streptococcus pneumoniae infections.
- Most reported cases involve S. pneumoniae serotype 3.
- The clinical significance of other serotypes, like 6B, in causing lung abscess is less understood.
Observation:
- A 67-year-old male presented with fever and was diagnosed with a lung abscess.
- The causative agent was identified as Streptococcus pneumoniae serotype 6B.
- The isolate showed a penicillin minimal inhibitory concentration (MIC) of 1 μg/mL.
Findings:
- Streptococcus pneumoniae serotype 6B was confirmed as the cause of lung abscess in this patient.
- High-dose intravenous sulbactam/ampicillin therapy was effective.
- Successful treatment was achieved without the need for surgical intervention.
Implications:
- This case highlights that Streptococcus pneumoniae serotype 6B can cause lung abscess.
- It underscores the importance of susceptibility testing for guiding antibiotic selection in S. pneumoniae lung abscess.
- The findings suggest that non-serotype 3 S. pneumoniae strains should also be considered in the differential diagnosis of lung abscess.
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