probiotic bacteria icon

acid anaerobes anaerobic bacillus bacteria bacterial bacteriology bacterium bifidobacteria bifidobacterium biological biology blue bowel capsule cell cilia coli colony contain digestion escherichia fermentation food germs gram icon iga immune immunity intestines isolated lactic lactobacillus microbe microbiology microorganism neutral pictogram positive prebiotic probiotic probiotics rod round seal shaped sign symbol vector worms