set of probiotic bacterias concept

lactobacillus biotechnology probiotic bifidobacteria bacillus prebiotic bacteria streptococcus healthy microbiota set propionibacterium microorganism icon fermentation bifidobacterium casei medical bulgaricus cell illustration microbe bacterium good escherichia micro thermophilus different acidophilus colony digestion round supplements system stomach human synbiotic vector flora abstract concept microbiome health medicine flat nutrition microbiology label ingredient fungi