Evidence map›Paper›PMID 20178591›Full record

ArticleBMC microbiology2010

The ecology of nasal colonization of Streptococcus pneumoniae, Haemophilus influenzae and Staphylococcus aureus: the role of competition and interactions with host's immune response.

Elisa Margolis, Andrew Yates, Bruce R Levin

Open access · goldAbstract read
In one paragraph

Article in BMC microbiology, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 75 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
75citing papers in PubMed, 1 pooled it
7.0field-weighted citation impact, top 3% 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

75 citing papers in PubMed, 1 synthesis or guideline pooled it, 144 citations in OpenAlex.

  1. Pooled it
  2. Trial
  3. Trial
  4. Article
  5. Characterization ofMicrobial genomics · 2026
    Article
  6. Article
  7. Computational and in vitro evaluation of probiotic treatments for nasalProceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  8. Article
  9. Article
  10. The Microbiome and Pediatric Transplantation.Journal of the Pediatric Infectious Diseases Society · 2024
    Review
  11. Article
  12. Article
  13. Article
  14. Article
  15. Article
  16. Selection ofFrontiers in cellular and infection microbiology · 2022
    Article
  17. Article
  18. Article
  19. Review
  20. Article

15 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

3 authors at 1 institution in 1 country.

Elisa MargolisDepartment of Biology, Emory University, Atlanta, GA 30322, USA.
Andrew Yates
Bruce R Levin
Emory University · US

Funding

MEDICAL SCIENTIST TRAINING PROGRAMT32GM008169 · NIGMS · EMORY UNIVERSITY · PI GROSS, ROBERT E · 1987 to 2021
$20.3M
Theoretical and experimental strudy of the population and evolutionary dynamics oR01GM091875 · NIGMS · EMORY UNIVERSITY · PI LEVIN, BRUCE RICHARD · 2009 to 2017
$2.5M
POPULATION GENETICS &EVOLUTION OF ANTIBIOTIC RESISTANCER01AI040662 · NIAID · EMORY UNIVERSITY · PI LEVIN, BRUCE RICHARD · 1997 to 2008
$1.1M
NIAID NIH HHS AI40662NIGMS NIH HHS R01 GM091875NIGMS NIH HHS T32 GM008169NIGMS NIH HHS T32GM08169
6 · The paper itself

Abstract

backgroundThe first step in invasive disease caused by the normally commensal bacteria Streptococcus pneumoniae, Staphylococcus aureus and Haemophilus influenzae is their colonization of the nasal passages. For any population to colonize a new habitat it is necessary for it to be able to compete with the existing organisms and evade predation. In the case of colonization of these species the competition is between strains of the same and different species of bacteria and the predation is mediated by the host's immune response. Here, we use a neonatal rat model to explore these elements of the ecology of nasal colonization by these occasionally invasive bacteria.

resultsWhen neonatal rats are colonized by any one of these species the density of bacteria in the nasal passage rapidly reaches a steady-state density that is species-specific but independent of inoculum size. When novel populations of H. influenzae and S. pneumoniae are introduced into the nasal passages of neonatal rats with established populations of the same species, residents and invaders coexisted. However, this was not the case for S. aureus - the established population inhibited invasion of new S. aureus populations. In mixed-species introductions, S. aureus or S. pneumoniae facilitated the invasion of another H. influenzae population; for other pairs the interaction was antagonistic and immune-mediated. For example, under some conditions H. influenzae promoted an immune response which limited the invasion of S. pneumoniae.

conclusionsNasal colonization is a dynamic process with turnover of new strains and new species. These results suggest that multiple strains of either H. influenzae or S. pneumoniae can coexist; in contrast, S. aureus strains require a host to have no other S. aureus present to colonize. Levels of colonization (and hence the possible risk of invasive disease) by H. influenzae are increased in hosts pre-colonized with either S. aureus or S. pneumoniae.

Indexed as

AnimalsAnimals, NewbornCarrier StateColony Count, MicrobialHaemophilus influenzaeHost-Pathogen InteractionsImmunity, InnateNasal CavityNasal MucosaNeutrophil InfiltrationQuorum SensingRatsRats, Sprague-DawleySpecies SpecificityStaphylococcus aureusStatistics, Nonparametric

Identifiers

PMID20178591
PMCPMC2844402
OpenAlexW2083880291

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.