Evidence map›Paper›PMID 33796103›Full record

ReviewFrontiers in immunology2021

The Hygiene Hypothesis - Learning From but Not Living in the Past.

Petra I Pfefferle, Corinna U Keber, Robert M Cohen, Holger Garn

Abstract readHistorical ArticleReview
In one paragraph

Review in Frontiers in immunology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 57 papers.

0numbers the graph read from it
0cells of the map it votes in
57citing papers in PubMed
–field-weighted citation impact
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

57 citing papers in PubMed.

  1. Trial
  2. Review
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  5. Article
  6. Review
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  9. Review
  10. Eating away at food allergy.Pediatric allergy and immunology : official publication of the European Society of Pediatric Allergy and Immunology · 2025
    Review
  11. Evaluating the Adjuvant Therapeutic Effects of Probiotic StrainsAnimals : an open access journal from MDPI · 2025
    Article
  12. Review
  13. Efficacy and Safety ofAdvances in respiratory medicine · 2025
    Review
  14. Article
  15. Neuroimmune Circuits in Allergic Diseases.Annual review of immunology · 2025
    Review
  16. Article
  17. Article
  18. Review
  19. Review
  20. 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

4 authors.

Petra I PfefferleComprehensive Biobank Marburg, Medical Faculty, Philipps University of Marburg, Comprehensive Biobank Marburg, Marburg, Germany.
Corinna U KeberComprehensive Biobank Marburg, Medical Faculty, Philipps University of Marburg, Comprehensive Biobank Marburg, Marburg, Germany.
Robert M CohenComprehensive Biobank Marburg, Medical Faculty, Philipps University of Marburg, Comprehensive Biobank Marburg, Marburg, Germany.
Holger GarnGerman Center for Lung Research (DZL), Marburg, Germany.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Postulated by Strachan more than 30 years ago, the Hygiene Hypothesis has undergone many revisions and adaptations. This review journeys back to the beginnings of the Hygiene Hypothesis and describes the most important landmarks in its development considering the many aspects that have refined and generalized the Hygiene Hypothesis over time. From an epidemiological perspective, the Hygiene Hypothesis advanced to a comprehensive concept expanding beyond the initial focus on allergies. The Hygiene Hypothesis comprise immunological, microbiological and evolutionary aspects. Thus, the original postulate developed into a holistic model that explains the impact of post-modern life-style on humans, who initially evolved in close proximity to a more natural environment. Focusing on diet and the microbiome as the most prominent exogenous influences we describe these discrepancies and the resulting health outcomes and point to potential solutions to reestablish the immunological homeostasis that frequently have been lost in people living in developed societies.

Indexed as

Adaptive ImmunityHygiene HypothesisImmunity, InnateAnimalsAsthmaBacteriaDietDysbiosisEvolution, MolecularGastrointestinal MicrobiomeHistory, 20th CenturyHistory, 21st CenturyHost-Pathogen InteractionsHumansImmune TolerancePhenotypeallergyasthmahygiene hypothesisimmune tolerancemicrobiomeT cell-response

Identifiers

PMID33796103
PMCPMC8007786

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

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.