good and bad gut bacteria

bacteria bacterial bad bifidobacteria bifidobacterium bloating bowel coli colon comparison constipation difference digestion digestive disease dysbiosis escherichia flora food good gut guts happy health healthcare ibd illness infection inflammation inflammatory intestinal intestine irritable lactobacillus large medical medicine microbiology microbiota microflora nutrition probiotics problem streptococcus supplements syndrome system toxic ulcer unhealthy vector wellbeing