good bacteria and bad bacteria in human intestines. bifidobacteria, lactobacilli, escherichia coli, campylobacter

anatomy aureus bacteria bacteriology bacterium bacteroides bad bifidobacteria bifidus body campylobacter care cartoon colon design digestion digestive dysbacteriosis dysbiosis enteric enterobacteria good harmful health icon illustration inspection intestinal intestine intestines lactobacilli lactobacillus lactococcus medical medicine microflora microscope probiotics science streptococcus vector