ArticleBMC infectious diseases2021
Invasive pneumococcal disease in persons with predisposing factors is dominated by non-vaccine serotypes in Southwest Sweden.
Article in BMC infectious diseases, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers, 1 of them a synthesis that pooled it.
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Who cites it
12 citing papers in PubMed, 1 synthesis or guideline pooled it, 13 citations in OpenAlex.
- Pooled it
- ZPY-CpG-Ch, a broad coverage vaccine againstScience advances · 2026Article
- Article
- Invasive pneumococcal disease by serotype 23B in an asplenic unvaccinated patient: A case report.IDCases · 2026Article
- Multisite infection with Austrian syndrome caused by non-vaccine pneumococcal serotype-case report.ASM case reports · 2025Article
- Serotype 3 pneumococcal pleural empyema: a case report and review of the epidemiology.European clinical respiratory journal · 2025Article
- An economic evaluation of pneumococcal conjugate vaccines, PCV20 versus PCV15, for the prevention of pneumococcal disease in the Swedish pediatric population.Human vaccines & immunotherapeutics · 2024Article
- Article
- The Molecular Approaches and Challenges ofPolish journal of microbiology · 2023Review
- Reduced quantity and function of pneumococcal antibodies are associated with exacerbations of COPD in SPIROMICS.Clinical immunology (Orlando, Fla.) · 2023Article
- Parapneumonic effusions related toBMJ open respiratory research · 2023Article
- Pneumococcal concentration and serotype distribution in preschool children with radiologically confirmed pneumonia compared to healthy controls prior to introduction of pneumococcal vaccination in Zanzibar: an observational study.BMC infectious diseases · 2022Observational
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Authors and funding
11 authors at 3 institutions in 1 country.
Funding
Abstract
backgroundThe pneumococcal conjugate vaccine PCV7 was introduced in Southwest Sweden in the child vaccination program in 2009, followed by PCV13 in 2010 and PCV10 in 2015. In this retrospective cohort study we assessed the pneumococcal serotype distribution in relation to predisposing factors, clinical manifestations and outcome during seven years after PCV introduction.
methodsClinical data from 1278 patients with 1304 episodes of invasive pneumococcal disease (IPD) between January 2009 and December 2015 in Region Västra Götaland, Sweden, were retrospectively collected from medical records. Pneumococcal isolates were serotyped by gel diffusion and/or Quellung reactions performed at the Public Health Agency in Sweden. Associations between serotypes and clinical characteristics were statistically evaluated by use of Fisher's exact test, Mann-Whitney U test and Logistic regression analysis, whereas IPD episodes caused by serotypes over time were analyzed by Mantel-Haenszel chi-square test.
resultsWith the exception of serotype 3, the prevalence of PCV13 serotypes decreased during the study period, from 76% (n = 157) of all IPD episodes in 2009 to 25% (n = 42) in 2015 (p < 0.001) while non-PCV13 serotypes increased, mainly among patients ≥65 years and in patients with predisposing factors, including cardiovascular disease, pulmonary disease and malignancy (p < 0.001 for all). Patients with predisposing factors, including those with malignancy, immune deficiency or renal disease, were more likely to have IPD caused by a serotype not included in PCV13 rather than a vaccine-included serotype. Serotype 3 was associated with intensive care unit admissions while serotype 1 and 7F caused IPD among healthier and younger patients. PCV13 serotypes were associated with invasive pneumonia, and non-PCV13 serotypes were associated with bacteremia with unknown focus and with manifestations other than pneumonia or meningitis.
conclusionsNon-PCV13 serotypes caused the majority of IPD cases in Southwest Sweden, especially in patients ≥65 years and in patients with predisposing factors. Serotype 3, included in PCV13, was prevalent and often caused severe disease.
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