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Table 7 Top 40 keywords with the highest frequency of occurrence

From: Emerging trends and hotspot in gut–lung axis research from 2011 to 2021: a bibliometrics analysis

Ranking Frequency Year of first occurrence Keyword
1 362 2013 Gut microbiota
2 280 2011 Inflammation
3 239 2011 Disease
4 238 2011 Infection
5 226 2011 Expression
6 201 2013 Microbiota
7 195 2011 Lung
8 190 2014 Microbiome
9 179 2011 Lung cancer
10 167 2011 Cancer
11 154 2011 Cell
12 144 2011 Asthma
13 115 2015 Intestinal microbiota
14 106 2013 Bacteria
15 106 2011 Mice
16 105 2011 In vitro
17 100 2013 Cystic fibrosis
18 100 2012 Activation
19 99 2013 T cell
20 88 2011 Mechanism
21 86 2011 Colorectal cancer
22 85 2013 Risk
23 84 2011 Identification
24 83 2012 Gut
25 78 2011 Immune response
26 74 2015 Immunity
27 73 2011 Pathogenesis
28 73 2011 Diagnosis
29 72 2013 Diversity
30 70 2011 Model
31 67 2013 Probiotics
32 65 2011 Oxidative stress
33 62 2013 Cell lung cancer
34 62 2014 Children
35 58 2016 Health
36 58 2018 Immunotherapy
37 56 2015 Biomarker
38 55 2011 Therapy
39 54 2013 Metabolism
40 53 2011 Obstructive Pulmonary disease