hand drawn probiotic bulgaricus bacteria. good microorganism for human health and digestion regulation. in

acidophilus bacillus background bacteria bacterium biochemistry biology biotechnology body bulgaricus cell digestion digestive drawing drawn engraving flora graphic gut hand health icon illustration ingredient intestines isolated logo macro medical medicine micro microbe microbiota microflora microorganism microscope molecule nutrition pencil prebiotic probiotic prophylactic regulation science sketch symbol therapeutic thermophiles vector yogurt