Evidence map›Paper›PMID 35340067›Full record

Observational studyJournal of internal medicine2022

Bacterial meningitis: Aetiology, risk factors, disease trends and severe sequelae during 50 years in Sweden.

Nils Block, Pontus Naucler, Philippe Wagner, Eva Morfeldt, Birgitta Henriques-Normark

Open access · hybridAbstract readObservational Study
In one paragraph

Observational study in Journal of internal medicine, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 22 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
22citing papers in PubMed, 1 pooled it
3.9field-weighted citation impact, top 6% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

22 citing papers in PubMed, 1 synthesis or guideline pooled it, 31 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. Article
  4. Article
  5. Community-acquired bacterial meningitis in Southern Sweden 2013-2023: a population-based study of incidence, aetiology and diagnostic yield.European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology · 2026
    Article
  6. Article
  7. Fulminant Multidrug-ResistantMicroorganisms · 2025
    Article
  8. Article
  9. Review
  10. Article
  11. Foreign Contaminants Target Brain Health.CNS & neurological disorders drug targets · 2025
    Review
  12. Article
  13. Article
  14. Review
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Clinical case reports · 2022
    Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 4 institutions in 1 country.

Nils BlockDepartment of Microbiology, Tumor and Cell biology (MTC), Biomedicum, Karolinska Institutet, Stockholm, Sweden.
Pontus NauclerDivision of Infectious Diseases, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.ORCID 0000-0002-8185-2648
Philippe WagnerCentre for Clinical Research Västmanland, Västmanland County Hospital, Uppsala University, Västerås, Sweden.
Eva MorfeldtPublic Health Agency of Sweden, Solna, Sweden.
Birgitta Henriques-NormarkDepartment of Microbiology, Tumor and Cell biology (MTC), Biomedicum, Karolinska Institutet, Stockholm, Sweden.ORCID 0000-0002-5429-4759
Public Health Agency of Sweden · SEKarolinska Institutet · SEKarolinska University Hospital · SEUppsala University · SE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundBacterial meningitis (BM) is a rare but severe infection. Few population-based studies have characterised BM episodes and sequelae over long periods.

methodsThis was a population-based observational cohort study with national coverage, using data on aetiological pathogens, sex, premorbid conditions, steroid pretreatment, severe sequelae and birth, death and diagnosis dates collected from 10,339 patients with BM reported to the National Board of Health and Welfare in Sweden between 1964 and 2014.

resultsDuring the 50-year study period, the incidence of BM decreased in young children, but not in the elderly. The most common cause of BM was pneumococci (34%), followed by Haemophilus influenzae (26%), and meningococci (18%), mainly community acquired. Premorbid conditions were found in 20%. After the H. influenzae type b vaccine was introduced in 1993, the BM incidence decreased by 36%. Following pneumococcal conjugated vaccine introduction in 2009, the incidence and 30-day mortality from pneumococcal meningitis decreased by 64% and 100%, respectively, in previously healthy children, and the 30-day mortality decreased by 64% among comorbid adults. The BM incidence in immunosuppressed patients increased by 3% annually post vaccine introduction. The 30-day mortality was 3% in children and 14% in adults, and the rate of severe sequelae was 44%. On average, patients lost 11 years of healthy life due to BM.

conclusionThe introduction of conjugated vaccines into the childhood vaccination program has reduced the incidence of BM in young children, but not in adults. Post vaccine introduction, patients present with more premorbid conditions and other bacterial causes of BM, emphasising the need for a correct diagnosis when treating these infections.

Indexed as

Meningitis, BacterialAdultAgedChildChild, PreschoolDisease ProgressionHumansIncidenceInfantPneumococcal VaccinesRisk FactorsStreptococcus pneumoniaeSwedenVaccines, ConjugatePneumococcal VaccinesVaccines, Conjugatebacterial meningitisconjugate vaccinesHaemophilus influenzaesevere sequelaeStreptococcus pneumoniae

Identifiers

PMID35340067
PMCPMC9544249
OpenAlexW4220804324

What OpenQuestion holds

Textmetadata
LicenceCC BY
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.