good and bad bacteria. gut flora of children. kids with intestines and different forms of bacteria

baby bacillus bacteria bacteriology bacterium bacteroides bad bifidobacteria bifidus care character children closeup coli colon comic cute design education enteric enterobacteria escherichia flora flu funny germ good gut health healthy human illness illustration inspection intestinal intestine kids lactic lactobacillus medical medicine micro microbe microorganism microscope organ probiotic probiotics set simple streptococcus vector veionella virus visceral