Evidence map›Paper›PMID 33603076›Full record

ArticleCommunications biology2021

Temporal association between human upper respiratory and gut bacterial microbiomes during the course of COVID-19 in adults.

Rong Xu, Renfei Lu, Tao Zhang, Qunfu Wu, Weihua Cai, Xudong Han, Zhenzhou Wan, Xia Jin, Zhigang Zhang, Chiyu Zhang

Abstract read
In one paragraph

Article in Communications biology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 85 papers, 6 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
85citing papers in PubMed, 6 pooled it
–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

85 citing papers in PubMed, 6 syntheses or guidelines pooled it.

  1. Pooled it
  2. COVID-19 alters human microbiomes: a meta-analysis.Frontiers in cellular and infection microbiology · 2023
    Pooled it
  3. Effect of bovine respiratory disease on the respiratory microbiome: a meta-analysis.Frontiers in cellular and infection microbiology · 2023
    Pooled it
  4. Pooled it
  5. Pooled it
  6. Pooled it
  7. Trial
  8. Article
  9. Gut microbial allies and adversaries in SARS-CoV-2 infection.Current research in microbial sciences · 2026
    Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Respiratory diseases and the gut microbiota: an updated review.Frontiers in cellular and infection microbiology · 2025
    Review
  15. Human microbiome in post-acute COVID-19 syndrome (PACS).Current research in microbial sciences · 2025
    Article
  16. Observational
  17. Review
  18. Article
  19. Article
  20. Review

25 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

10 authors.

Rong Xu *Shanghai Public Health Clinical Center, Fudan University, Shanghai, China.
Renfei Lu *Clinical Laboratory, Nantong Third Hospital Affiliated to Nantong University, Nantong, China.
Tao Zhang *State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming, Yunnan, China.
Qunfu Wu *State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming, Yunnan, China.
Weihua CaiClinical Laboratory, Nantong Third Hospital Affiliated to Nantong University, Nantong, China.
Xudong HanClinical Laboratory, Nantong Third Hospital Affiliated to Nantong University, Nantong, China.
Zhenzhou WanMedical Laboratory of Taizhou Fourth People's Hospital, Taizhou, China.
Xia JinShanghai Public Health Clinical Center, Fudan University, Shanghai, China. jinxia@shphc.org.cn.
Zhigang ZhangState Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming, Yunnan, China. zhangzhigang@ynu.edu.cn.
Chiyu ZhangShanghai Public Health Clinical Center, Fudan University, Shanghai, China. zhangcy1999@hotmail.com.ORCID 0000-0001-8735-9857

Funding

Chinese Academy of Sciences Key Project (CAS Key Project) 2017ZX10103009-002Chinese Academy of Sciences Key Project (CAS Key Project) 2018YFC2000500
6 · The paper itself

Abstract

SARS-CoV-2 is the cause of COVID-19. It infects multiple organs including the respiratory tract and gut. Dynamic changes of regional microbiomes in infected adults are largely unknown. Here, we performed longitudinal analyses of throat and anal swabs from 35 COVID-19 and 19 healthy adult controls, as well as 10 non-COVID-19 patients with other diseases, by 16 S rRNA gene sequencing. The results showed a partitioning of the patients into 3-4 categories based on microbial community types (I-IV) in both sites. The bacterial diversity was lower in COVID-19 patients than healthy controls and decreased gradually from community type I to III/IV. Although the dynamic change of microbiome was complex during COVID-19, a synchronous restoration of both the upper respiratory and gut microbiomes from early dysbiosis towards late more diverse status was observed in 6/8 mild COVID-19 adult patients. These findings reveal previously unknown interactions between upper respiratory and gut microbiomes during COVID-19.

Indexed as

Gastrointestinal MicrobiomeMicrobiotaSARS-CoV-2AdolescentAdultAgedCOVID-19FemaleHumansMaleMiddle AgedRespiratory SystemRNA, Ribosomal, 16SYoung AdultRNA, Ribosomal, 16S

Identifiers

PMID33603076
PMCPMC7893062

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Registered trials

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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.