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Anders Hammerich Riis

Pneumococcal serotypes and mortality following invasive pneumococcal disease: a population-based cohort study

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  • Zitta B Harboe, Denmark
  • Reimar W Thomsen
  • Anders Riis
  • Palle Valentiner-Branth, Denmark
  • Jens Jørgen Christensen, Denmark
  • Lotte Lambertsen, Denmark
  • Karen A Krogfelt, Denmark
  • Helle B Konradsen, Denmark
  • Thomas L Benfield, Denmark
  • Department of Clinical Epidemiology
BACKGROUND: Pneumococcal disease is a leading cause of morbidity and mortality worldwide. The aim of this study was to investigate the association between specific pneumococcal serotypes and mortality from invasive pneumococcal disease (IPD). METHODS AND FINDINGS: In a nationwide population-based cohort study of IPD in Denmark during 1977-2007, 30-d mortality associated with pneumococcal serotypes was examined by multivariate logistic regression analysis after controlling for potential confounders. A total of 18,858 IPD patients were included. Overall 30-d mortality was 18%, and 3% in children younger than age 5 y. Age, male sex, meningitis, high comorbidity level, alcoholism, and early decade of diagnosis were significantly associated with mortality. Among individuals aged 5 y and older, serotypes 31, 11A, 35F, 17F, 3, 16F, 19F, 15B, and 10A were associated with highly increased mortality as compared with serotype 1 (all: adjusted odds ratio >or=3, p<0.001). In children younger than 5 y, associations between serotypes and mortality were different than in adults but statistical precision was limited because of low overall childhood-related mortality. CONCLUSIONS: Specific pneumococcal serotypes strongly and independently affect IPD associated mortality.
Original languageEnglish
JournalP L o S Medicine
Pages (from-to)e1000081
Publication statusPublished - 2009

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