Table 3.

Microbiota changes in irritable bowel syndrome patients

First author [Ref.], year	Study group	Samples	Phyla	Genus/species
Wang [102], 2019	20 diarrhea-predominant IBS/40 healthy controls	stool	↑ Bacteroidetes ↓ Firmicutes	↑ Bacteroides ↑ Prevotella ↑ Paraprevotella ↓ Faecalibacterium ↓ Lachnospiracea incertae sedis ↓ Blautia ↓ Coprococcus
Labus [99], 2017	29 IBS/23 healthy controls	stool	↑ Firmicutes ↑ Actinobacteria ↑ Proteobacteria ↓ Bacteroidetes
Giamarellos-Bourboulis [98], 2015	74 IBS/163 non-healthy non-IBS/21 healthy controls	duodenal aspirate		↑ Escherichia/Shigella ↑ Escherichia coli ↑ Klebsiella pneumoniae ↓ Acinetobacter ↓ Citrobacter ↓ Leuconostoc ↓ Lactococcus
Rajilic-Stojanovic [100], 2011	62 IBS/46 healthy individuals	stool	↑ Firmicutes ↓ Bacteroidetes	↑ Dorea ↑ Ruminococcus ↑ Clostridium ↑ Roseburia ↓ Bifidobacterium ↓ Faecalibacterium ↓ Bacteroides

IBS, irritable bowel syndrome.