probiotic bacteria set in circle. gut microbiota with healthy prebiotic bacillus.

probiotic bacteria microbiota gut microbiome healthy bacillus prebiotic microbe icon vector germ nutrition abstract illustration ingredient round virus bacterium biochemistry biotechnology design digestion graphic isolated stomach symbol lactobacillus acidophilus microbiology acid bifidobacteria concept lactic microorganism system yogurt different medicine fermentation good bifidobacterium bifidum cell human synbiotic