good and bad bacteria in human intestines set, tiny people study bowel with microscope

good bad bacteria human set tiny people magnifying glass microscope research small microbe bacillus lactobacillus bacterium bowel cartoon vector illustration overgrowth gut intestine digestive leaky flat unhealthy sibo inflammation gastrointestinal tract probiotics microbiome health character anatomy healthy immunity food yogurt cell germ microorganism microflora colon system concept woman man flora