Evidence map›Paper›PMID 22084077›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2011

Socially transmitted gut microbiota protect bumble bees against an intestinal parasite.

Hauke Koch, Paul Schmid-Hempel

Open access · bronzeAbstract readComparative Study
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 389 papers.

0numbers the graph read from it
0cells of the map it votes in
389citing papers in PubMed
52.3field-weighted citation impact, top 1% 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

389 citing papers in PubMed, 864 citations in OpenAlex.

  1. Review
  2. Article
  3. Article
  4. Behavioral and Microbial Profiling of the Bethylid WaspBiological control : theory and applications in pest management · 2026
    Article
  5. Article
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  7. The symbiotic bacteriaMicrobiology spectrum · 2026
    Article
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  12. Review
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329 more citing papers are in PubMed but not listed here.

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

2 authors at 1 institution in 1 country.

Hauke KochInstitute of Integrative Biology, Swiss Federal Institute of Technology, ETH, Zürich, CH-8092 Zürich, Switzerland.
Paul Schmid-Hempel
ETH Zurich · CH

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Populations of important pollinators, such as bumble bees and honey bees, are declining at alarming rates worldwide. Parasites are likely contributing to this phenomenon. A distinct resident community of bacteria has recently been identified in bumble bees and honey bees that is not shared with related solitary bee species. We now show that the presence of these microbiota protects bee hosts against a widespread and highly virulent natural parasite (Crithidia bombi) in an experimental setting. We add further support to this antagonistic relationship from patterns found in field data. For the successful establishment of these microbiota and a protective effect, exposure to feces from nest mates was needed after pupal eclosion. Transmission of beneficial gut bacteria could therefore represent an important benefit of sociality. Our results stress the importance of considering the host microbiota as an "extended immune phenotype" in addition to the host immune system itself and provide a unique perspective to understanding bees in health and disease.

Indexed as

CrithidiaParasite LoadAnimalsBase SequenceBeesDNA PrimersFecesGammaproteobacteriaGastrointestinal TractMicrosatellite RepeatsMolecular Sequence DataPolymorphism, Restriction Fragment LengthRNA, Ribosomal, 16SSequence Analysis, DNASwitzerlandDNA PrimersRNA, Ribosomal, 16S

Identifiers

PMID22084077
PMCPMC3228419
OpenAlexW2104363601

What OpenQuestion holds

Textmetadata
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.