probiotics. gut flora: good and bad bacteria.

bacillus bacteria bacteriology bacterium bacteroides bad bifidobacteria bifidobacterium bifidus body care coli colon digestive enteric enterobacteria flora germ good gut harmful health healthy helicobacter hormone human image inspection intestinal intestine lactic lactobacillus medical medicine microbes microflora microorganisms microscope organ probiotic probiotics pylori salmonella small streptococcus veionella visceral