Influence of pneumococcal serotype group on outcome in adults with bacteraemic pneumonia

M. Luján, M. Gallego, Y. Belmonte, D. Fontanals, J. Vallès, T. Lisboa, J. Rello

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53 Citations (Scopus)


The influence of infecting serotype group on outcome in bacteraemic pneumococcal pneumonia remains unclear. We performed a prospective, 10-yr observational study in an 800-bed teaching hospital. 299 adults diagnosed with pneumonia whose blood cultures showed growth of Streptococcus pneumoniae were included in the study. High invasive disease potential (H) serotypes included serotypes 1, 5 and 7F, which served as a reference category, were compared with low invasive disease potential (L) serotypes (3, 6A, 6B, 8, 19F, and 23F) and other (O) serotypes (non-H, non-L). The influence on outcome was determined for each group of serotypes after adjusting for underlying conditions and severity of illness at admission. Overall, 30-day mortality was 11%. H serotypes (n=93) infected primarily younger people and presented a higher risk of complicated parapneumonic effusion or empyema (17.2 versus 5.1%; p=0.01), with lower mortality (3.2%). The isolation of L serotypes (n=78) was an independent risk factor for 30-day mortality (OR 7.02, 95% CI 1.72-28.61), as were Charlson score (OR 1.30, 95% CI 1.08-1.58), alcohol abuse (OR 3.99, 95% CI 1.39-11.39) and severity of illness measured by American Thoracic Society (ATS)/Infectious Diseases Society of America (IDSA) criteria (OR 4.80, 95% CI 1.89-12.13). A vaccination strategy including serotypes 3, 6A, 6B, 8, 19F and 23F may improve survival in adults. Copyright©ERS 2010.
Original languageEnglish
Pages (from-to)1073-1079
JournalEuropean Respiratory Journal
Issue number5
Publication statusPublished - 1 Nov 2010


  • Bacteraemic pneumococcal pneumonia
  • Conjugated vaccines
  • Serotypes
  • Streptococcus pneumoniae


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