bifidobacterium bifidum icon.good probiotic for human health sign.

acidophilus bacillus background bacteria bacterial bacteriology bacterium bifidobacterium biotechnology casei cell coli editable element escherichia fermentation food germ good graphic gut health healthy human icon lactic lactobacillus line medicine microbial microbiology microbiome microbiota microorganism milk normal organism outline prebiotic probiotic propionibacterium science sign streptococcus symbol therapeutic thermophilus thin vector