lactococcus probiotics on white

good gut flora illustration medical icon bacterial bad microorganisms set concept background germ bacterium bacillus bacteria probiotic lactococcus lactobacillus human bifidobacteria medicine microbe bifidobacterium microorganism digestion propionibacterium biology streptococcus bacteriology cell coli cancer organism fungi logo micro sign symbol thermophilus virus yoghurt biological fermentation lactic escherichia prebiotic vector intestine microscope